Really thankful that my last post magically didn't post to the forum so I'll try again.
I am having a problem with my MG8725 modem/router. This is an approved modem from Xfinity and I bought this in May after dealing with months of issues, tech visits, and no solutions on a DHCPv6 issue within my XB7 modem. The last tech I had out just straight up told me to get my own as the Xfinity-provided modems can not only be refurbished, but also just do not allow anyone to change core administrative properties of the modem. For example, if I could've just adjusted the DHCPv6 lease time, I wouldn't have to deal with internet dropouts every hour when the DHCPv6 lease renewed. Within those months of tech appointments and trouble shooting, I had the entire pipeline replaced from the line coming to the house from the street, the lines within the box on the side of my house, the line running from the box on the side of my house into a hole in the side of my first floor, and the modem is and was connected to a port on the adjacent side of the wall from where the Xfinity line enters the house (so no splitters, unnecessary runs...). After changing the XB7 for the MG8725, I have been able to properly set my admin panel to only allow IPv4 (which seems to have eliminated any DHCPv6 errors that plagued me in the past), and port forward on command (another flaw of the crappy Xfinity app).
I have been having 2 problems with my MG8725, but one I am unsure of the severity or consequence.
The first problem is the connectivity of just the 2.4Ghz band of the wifi. It seems to just drop all devices after hours or a day, while remaining up and active on scanners, the Motorola app, etc. This has been a real pain, as the only remedy for this seems to be a reboot of the modem, which means I am rebooting my modem every day, sometimes twice a day. Normally, I wouldn't care too much if only one band was acting up, however my Ring doorbell can only connect via 2.4Ghz, so this means my doorbell is not recording or accessible during this downtime. This is a real issue because I am missing key events that are happening at my house (package drop off, snooping kids, etc.). I have posted my connection stats and logs below for any reference, as someone here may be able to spot something before I go through the rigmarole of getting a tech out here for the millionth time this year. The 5Ghz band, as well as ethernet, seem to be unaffected, and with only a few 2.4-dependent devices on that band, it hard to know a) when the 2.4ghz band drops and b) if there is a correlation with some kind of other event I am noticing or in the system logs.
The second issue is a blinking blue downstream light on the modem. Per Motorola, this indicates that the downstream is negotiating multiple channels. This light will start blinking randomly sometime after a reboot and never stop. It is unclear if it is linked to the wifi issue, however I have seen it be blinking and both wifi networks are online and fine. If anyone has any info on this or if it is just a normal thing to do, let me know.
My connection stats are below:
Startup Sequence |
 |
|
|
|
Startup Step |
Status |
Comment |

|
Acquire Downstream Channel |
579000000 Hz |
Locked |
 |
Upstream Connection |
OK |
Operational |
 |
Boot State |
OK |
Operational |

|
Configuration File |
OK |
|
 |
Security |
Enabled |
BPI+ |
 |
|
Connection Status |
 |
|
|
|
System Up Time |
1 days 0h: 37m: 12s |
|
 |
Network Access |
Allowed |
|
 |
|
Downstream Bonded Channels |
 |
|
 |
|
Channel |
Lock Status |
Modulation |
Channel ID |
Freq. (MHz) |
Pwr (dBmV) |
SNR (dB) |
Corrected |
Uncorrected |
1 |
Locked |
256 QAM |
17 |
579.0 |
-4.0 |
41.4 |
0 |
0 |
2 |
Locked |
256 QAM |
2 |
483.0 |
-2.8 |
42.2 |
0 |
0 |
3 |
Locked |
256 QAM |
3 |
489.0 |
-3.3 |
42.0 |
0 |
0 |
4 |
Locked |
256 QAM |
4 |
495.0 |
-3.0 |
42.0 |
0 |
0 |
5 |
Locked |
256 QAM |
5 |
507.0 |
-3.8 |
41.8 |
0 |
0 |
6 |
Locked |
256 QAM |
6 |
513.0 |
-3.9 |
41.7 |
0 |
0 |
7 |
Locked |
256 QAM |
7 |
519.0 |
-4.7 |
41.3 |
0 |
0 |
8 |
Locked |
256 QAM |
8 |
525.0 |
-5.3 |
40.9 |
0 |
0 |
9 |
Locked |
256 QAM |
9 |
531.0 |
-5.3 |
40.8 |
0 |
0 |
10 |
Locked |
256 QAM |
10 |
537.0 |
-5.2 |
40.8 |
0 |
0 |
11 |
Locked |
256 QAM |
11 |
543.0 |
-5.8 |
40.5 |
0 |
0 |
12 |
Locked |
256 QAM |
12 |
549.0 |
-5.3 |
40.7 |
0 |
0 |
13 |
Locked |
256 QAM |
13 |
555.0 |
-4.7 |
41.0 |
0 |
0 |
14 |
Locked |
256 QAM |
14 |
561.0 |
-4.5 |
41.2 |
0 |
0 |
15 |
Locked |
256 QAM |
15 |
567.0 |
-3.6 |
41.6 |
0 |
0 |
16 |
Locked |
256 QAM |
16 |
573.0 |
-3.7 |
41.6 |
0 |
0 |
17 |
Locked |
256 QAM |
18 |
585.0 |
-4.1 |
41.5 |
0 |
0 |
18 |
Locked |
256 QAM |
19 |
591.0 |
-5.3 |
40.8 |
0 |
0 |
19 |
Locked |
256 QAM |
20 |
597.0 |
-6.5 |
39.8 |
0 |
0 |
20 |
Locked |
256 QAM |
21 |
603.0 |
-6.8 |
39.8 |
0 |
0 |
21 |
Locked |
256 QAM |
22 |
609.0 |
-6.5 |
40.0 |
0 |
0 |
22 |
Locked |
256 QAM |
23 |
615.0 |
-7.1 |
39.4 |
0 |
0 |
23 |
Locked |
256 QAM |
24 |
621.0 |
-6.5 |
39.9 |
21 |
0 |
24 |
Locked |
256 QAM |
25 |
627.0 |
-6.3 |
40.0 |
20628292 |
12042302 |
25 |
Locked |
256 QAM |
26 |
633.0 |
-5.8 |
40.3 |
3063189 |
130427 |
26 |
Locked |
256 QAM |
27 |
639.0 |
-5.4 |
40.6 |
2002463 |
388137 |
27 |
Locked |
256 QAM |
28 |
645.0 |
-3.7 |
41.9 |
0 |
0 |
28 |
Locked |
256 QAM |
29 |
651.0 |
-3.4 |
41.9 |
0 |
0 |
29 |
Locked |
256 QAM |
30 |
657.0 |
-3.7 |
41.9 |
0 |
0 |
30 |
Locked |
256 QAM |
31 |
663.0 |
-3.1 |
42.0 |
0 |
0 |
31 |
Locked |
256 QAM |
32 |
669.0 |
-4.0 |
41.6 |
0 |
0 |
32 |
Locked |
OFDM |
33 |
690.0 |
-6.4 |
0.0 |
875115097 |
5199301 |
|
Upstream Bonded Channels |
 |
|
 |
|
Channel |
Lock Status |
Channel Type |
Channel ID |
Symb. Rate (Ksym/sec) |
Freq. (MHz) |
Pwr (dBmV) |
1 |
Locked |
SC-QAM |
1 |
5120 |
35.6 |
55.3 |
2 |
Locked |
SC-QAM |
2 |
5120 |
29.2 |
55.3 |
3 |
Locked |
SC-QAM |
3 |
5120 |
22.8 |
56.0 |
4 |
Locked |
SC-QAM |
4 |
5120 |
16.4 |
57.0 |
5 |
Locked |
SC-QAM |
5 |
1280 |
39.6 |
52.8 |
|
Downstream Frequency Setting |
 |
|
|
|
Downstream Frequency Select |
|
|
 |
|
Network WAN Connection |
 |
|
|
|
IPv4 Address |
xxxxxxxxxxxx |
|

|
Lease Time Remaining |
D: 00 H: 22 M: 08 S: 33 |
|

|
Lease Expiration Time |
Sat Jul 15 07:01:19 2023 |
|
 |
MAC Address |
xxxxxxxxxxx |
|
 |
WAN Connection Type |
DHCP |
|
 |
|
The logs most recently:
Event Log
Time Priority Description
11:25:30
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 5; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:25:56
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:28:56
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:29:18
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:29:18
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:29:21
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 5; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:29:28
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:29:55
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:48:52
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
11:49:03
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:14:57
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:15:07
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:23:42
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:24:08
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:51:35
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:51:56
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:52:11
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:52:29
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:54:00
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:54:19
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:57:10
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
12:57:26
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
13:47:56
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
13:48:10
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
14:03:15
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
14:03:30
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
14:04:48
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
14:05:16
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
17:46:50
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
17:46:53
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
18:31:37
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
18:31:53
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
20:14:44
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
20:15:08
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
22:02:22
Thu Jul 13 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
22:02:49
Thu Jul 13 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
05:52:53
Fri Jul 14 2023 Warning(5) MDD message timeout;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
05:53:14
Fri Jul 14 2023 Notice(6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
07:16:58
Fri Jul 14 2023 Notice(6) CM-STATUS message sent. Event Type Code: 22; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.1;
BruceW
Gold Problem Solver
•
26.3K Messages
2 years ago
You have signal problems. The downstream QAM channel power levels are lower than they should be, and several around 633 MHz have very high error counts. The OFDM channel has high uncorrectable error counts as well. And all the upstream channel power levels are out of spec (too high).
Network connection problems like this are often due to poor coax connections or damaged coax cable, usually in or near your home. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power.
If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you still need help you'll need to have Comcast back out to clean up their mess.
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
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