Connectivity Issues with 3rd party modem (Netgear CM1150V) - Comcast Tech Request Please
History of my issue
CM1150V on Xfinity 600Mbps plan
Worked perfectly for almost a year - consistent full spec speeds
Around mid Nov, began to have frequent drop-outs and occasionally throughout day but EVERY morning would have to power cycle modem to re-establish connection
After dealing with that EVERY DAY for about 2 weeks, called out Xfinity.
Xfinity Tech checked lines all way to street interface - no issues, installed Xfinity XB7 and all was perfect (immediate and consistent thereafter);
Felt confident this was a hardware issue as it appeared the XB7 resolved the issue i.e. it worked consistently, the CM1150V did not.
Received replacement CM1150V 12 days ago and re-commissioned with Xfinity
Initially worked perfectly and consistently for 10 days then suddenly 2 days ago began having identical issues to first one
(this makes me wonder if in both instances a firmware 'upgrade' was pushed by Xfinity?)
(have since learned this is the std firmware at this time, so I don't believe that to be the case- I can also see that my signal levels are now higher than they were a couple of weeks ago)
Here is log from the last 12 hrs or so - note that this was while the Modem was essentially unused during the night!
Came down this morning to find no internet connection and attached is the Event log showing the period of preceding 12 hrs or so
6:44am is when I power cycled the Modem, so those errors pertain to that.
(after power cycling the modem it came back on line at full download and upload spec speeds - this behaviour is consistent with that of the initial modem after a power cycle)
I have included images of the Event Error Log, the Baseline Modem Status when it was working perfectly when installed on 12-15 and the Modem Status yesterday (when there was no Internet Connection)
Only differences I see in the Modem Status are:
The Download Frequencies are much higher generally in the baseline
There is a high incidence of 'correctables' in the problem status of yesterday
Other interesting notables
When a Download has been established and continuous (e.g. such as streaming a movie or live sports through my subscriptions) it tends to remain consistent until there is a break in download traffic (once it has been idle, it will not re-establish a connection)
Another way to recover the connection besides the Power Cycle of the modem is just to keep requesting a Speed Test (I use the Ookla App downloaded on my devices) - this one is curious - I can request multiple times and it fails, then finally it will connect with very slow download speed (only a few Mbps) initially and then the upload part of the test is at full spec (18Mbps); the very next speed test (run immediately after) will deliver full speed down and up.
A modem power cycle will immediately re-establish full spec speed once reboot completes.
The behaviour is now identical on second modem as was the original
Both Modems were performing perfectly & consistently before suddenly becoming consistently problematic
(again this makes me suspect a firmware upgrade?)
But almost certainly rules out Hardware
The XB7 had zero issues during its 3 weeks installation (and problem was consistent with initial CM1150V prior to the XB7 install which instantly resolved it)
What does the log indicate was going on during that night time (supposedly idle) period?
- can you take a look at this?