XFinity speed slows down...modem restart fixes it...slows down again...restart fixes it again...etc

Hi Everyone,

 

So I have a weird issue with my XFinity internet. I am currently on the Performance Plus w/Speed Increase (additional $15 per month) about ~ 150Mbps/5Mbps package. My modem is an Arris SB6183 with firmware D30CM-OSPREY-2.4.0.0-GA-03-NOSH.

 

My setup consists of the modem and my laptop plugged straight into the back of the modem via ethernet cord. No routers...no WiFi...no other devices...just my laptop.

 

My speed drops to about 50 Mbps down every day. I restart the modem, and the speed shoots up to 200 Mbps (which is awesome...) but this only lasts about 10-15 minutes. After 10-15 minutes, the speed drops down to about 50 Mbps again. 

 

I called the Tech folks, they recommended to get another modem. So I did... TWO of them:  Netgear CM500 and Arris SB6190. The issue remains:  fast connection when modem starts...slow connection after about 15 minutes. 

 

I live in an apartment complex that was built around 2003-2004. I don't have access to any coaxial wiring (I looked in the obvious closets or electrical panel...but nothing there). I have one coaxial port in the living room and one in the bedroom. Using either one of them has the same effect.

 

If you look at my signal levels below, you will see that the Downstream Bonded channels are on the margin (~ -9dBm) After reading about this, I think ISP want the levels to be -5 dBm to + 5dBm...correct  ? 

 

But the same signals levels are present when I have the fast connection or slow connection. Also, this happens at 3AM when everyone is asleep or Saturday afternoon when the entire apartment complex is streaming movies:

 

1	Locked	QAM256	25	669000000 Hz	-8.8 dBmV	39.4 dB	0	0
2	Locked	QAM256	26	675000000 Hz	-9.3 dBmV	38.4 dB	0	0
3	Locked	QAM256	27	681000000 Hz	-8.8 dBmV	39.4 dB	0	0
4	Locked	QAM256	28	687000000 Hz	-8.1 dBmV	39.6 dB	0	0
5	Locked	QAM256	29	693000000 Hz	-8.8 dBmV	39.2 dB	0	0
6	Locked	QAM256	30	699000000 Hz	-8.5 dBmV	39.5 dB	0	0
7	Locked	QAM256	31	705000000 Hz	-7.5 dBmV	39.9 dB	0	0
8	Locked	QAM256	32	711000000 Hz	-8.3 dBmV	39.6 dB	0	0
9	Locked	QAM256	33	717000000 Hz	-7.8 dBmV	39.7 dB	0	0
10	Locked	QAM256	34	723000000 Hz	-7.3 dBmV	39.9 dB	0	0
11	Locked	QAM256	35	729000000 Hz	-7.5 dBmV	37.8 dB	13	0
12	Locked	QAM256	36	735000000 Hz	-7.1 dBmV	36.8 dB	42	0
13	Locked	QAM256	37	741000000 Hz	-7.6 dBmV	36.7 dB	0	0
14	Locked	QAM256	38	747000000 Hz	-7.2 dBmV	35.9 dB	1274	0
15	Locked	QAM256	39	753000000 Hz	-6.8 dBmV	34.3 dB	417623	751076
16	Locked	QAM256	40	759000000 Hz	-8.0 dBmV	39.7 dB	0	0

 

Upstream Bonded Channels
Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	3	5120 Ksym/sec	23700000 Hz	47.5 dBmV
2	Locked	ATDMA	1	5120 Ksym/sec	36500000 Hz	47.5 dBmV
3	Locked	ATDMA	2	5120 Ksym/sec	30100000 Hz	47.5 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	17300000 Hz	47.5 dBmV

 

Screenshots below:

 

 

It is almost as if a throttling is activated ... since the slow down happens fairly consitently after about 10-15 minutes of the modem being on. Any suggestions or info would be much appreciated. Should a tech come out to teh apartment ? Thanks kindly!