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MT8733 - 2.4 Ghz Wifi Drops, 5Ghz Wifi Remains Connected
I have a Motorola MT8733 on Xfinity's 1200Mbps plan.
Randomly throughout the day, my 2.4Ghz wifi band drops connection to all devices. 5Ghz wifi band and hard wired connections remains unaffected. The issue remains until I either reset the modem via the modems UI itself, or via the Xfinity App. There seems to be no pattern in the problem, sometimes it happens in the middle of the night, sometimes during the day, but it happens at least 2-3 times a day
Some specifics about my setup... I have Band Steering Off, with two different SSIDs, one for 2.4G and one for 5G. On 2.4G I have the Channel set to 11 and Bandwidth at 20Mhz. I have played around with the channels, 1, 6, 11, auto, but none seem to help the situation. I have no other customizations on my modem. I do have about ~30 devices connected wirelessly to 2.4Ghz, but my older modem was able to handle this fine. Further, I have a tough time believing this is signal interference. During the disconnection phenomenon I'm able to run a Wifi Analyzer/Scan and see that 2.4Ghz signal never really drops below -45dBm. Even as all of my 2.4G devices are disconnected, I am still producing a strong signal, just unable to connect to it or the internet. The 2.4G band will even continue to show as an option on my computer/phone, but you're unable to connect to it until I reset the modem. Lastly, I've even installed a smart plug that restarts my modem nightly, but it still hasn't solved my issues.
This disconnection event creates no information in my modems logs. I do randomly get the following log events, but they do not sync up with the time that I get the problem:
11:45:00
Sun Mar 5 2023 Critical(3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
11:45:17
Sun Mar 5 2023 Warning(5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
11:45:18
Sun Mar 5 2023 Warning(5) Dynamic Range Window violation
11:45:18
Sun Mar 5 2023 Warning(5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
11:45:18
Sun Mar 5 2023 Warning(5) Dynamic Range Window violation
11:45:18
Sun Mar 5 2023 Warning(5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
11:45:18
Sun Mar 5 2023 Warning(5) Dynamic Range Window violation
11:45:18
Sun Mar 5 2023 Critical(3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
Other threads that note these issues seem to point to line interference. For my situation there, the Xfinity box is on the outside of the house... but months ago we had a tech come out and drill a hole directly in to the side of the house... so the line goes from the box to a singular wall outlet, and I'm only able to use that one outlet for my modem. No kinks, critter interference, splitters, etc.
Possibly an aside from all of this, my internet connection is much slower than expected. Even hardwired directly to the modem, my speed never reaches above 130-150mbps. I realize getting to 1.2Ghz is unrealistic, but in my opinion this is slow for the most premium service offered.
One thing I have seen on these forums is receiving a "reprovisioning signal" from Xfinity. I admittedly am not entirely sure what this does, but I feel like I'm running out of options and this would be something that's worth a shot.
Please let me know if I can provide any additional details.
EG
Expert
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110K Messages
2 years ago
Please also copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
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ShCh_1e303b
Visitor
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7 Messages
2 years ago
Downstream Bonded Channels
Upstream Bonded Channels
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EG
Expert
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110K Messages
2 years ago
The signal status values at that snapshot in time were good but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel / return path impairment somewhere.
There are other signal stat values that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS (Cable Modem Termination System) to check for any real-time degradation and / or error reports, see your node / cable plant, and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll the CMTS for those upstream receive signal stats.
You should get a reply here in your topic. Good luck !
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user_a7358a
Visitor
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2 Messages
2 years ago
I have basically the same issue. I had an older Motorola Surfboard modem and a Netgear WIFI router and was dropping connections a few times a week on both the 5 GHz and 2.4 GHz bands. I got tired of resetting both units, so I purchased a MT8733. Now about once a day the 2.4 GHz drops. I have quite a few smart devices (lights, appliances, alarm system) that only support the 2.4. When I try to reconnect to the 2.4 GHz channel my phone, computer, etc. sees the channel but can't connect to the internet (appears to let me connect to the modem, but with no internet). I power cycle it and everything is great for a while.
I need some help. Thanks.
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user_d9c807
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1 Message
2 years ago
I have basically the same issue about once a day the 2.4 GHz drops. I have quite a few smart devices (lights, appliances, cameras) that only support the 2.4. When I try to reconnect to the 2.4 GHz channel my phone, computer, etc. sees the channel but can't connect to the internet (appears to let me connect to the modem, but with no internet). I power cycle it and everything is great for a while. Having a new baby soon and can not have this continue.
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user_a7358a
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2 Messages
2 years ago
I am having the same problem with an MT8733 I purchased a month or two ago. I used to power cycle the box but found that through the Motorola motosync app I can turn off the 2.4 then turn it back on. 5 GHz seems much more stable, maybe reseting it once a month. The 2.4 is a daily occurrence. Interestingly, this seems to also reset the 5 GHz band since that drops out for a minute or so. I would like to figure out what is going on. I had an older Motorola SurfBoard modem and a Netgear WIFI router that also had the same issue with dropping the 2.4, that's why I changed to the MT8733 but saw no change. Also, same as user d9c807 above, when it drops it just seems to lose connection to the internet, but appears to talk between the device and the modem.
(edited)
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C_ewoldt
2 Messages
2 years ago
Same exact problem with Motorola router modem. 2.4 ghz stream disconnects every single night. Have to reconnect my nest thermostat and Firestick every single day. What’s going on? I need help.
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ShCh_1e303b
Visitor
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7 Messages
2 years ago
As the thread owner… I can say that I got confirmation that it was an issue with the modem itself and not the service. After I replaced my Motorola modem with a Netgear CAX80 I had no more issues. Likely not the answer everyone wants
(edited)
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