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CM1150V bandwidth intermittentently drops to below 1 mbps with Xfinity
When I first got this modem, everything was awesome, fast, stable, low latency, and no Intel Puma chipset issues. But now I'm intermittently rebooting the modem up to 12 times a day when speed of my...
What wireless router brand and model do you have connected to the CM modem?
How are you speed testing? WIred or wireless?
Over in one of the Xfinity forum posts, someone pointed out that there might be an upload signal threshold of 48 dBmV on this modem that is perhaps looser with Xfinity branded modems. Does such a limitation exist?
https://forums.xfinity.com/t5/Your-Home-Network/Netgear-CM1150V-Internet-Connectivity/m-p/3376884
This is what my modem looks like when the connection is normal:
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Then when bandwith is nil
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Here is my CM1200 on the UP:
Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 36000000 Hz 39.3 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29000000 Hz 38 dBmV 3 Locked ATDMA 5 5120 Ksym/sec 22000000 Hz 38.5 dBmV 4 Locked ATDMA 6 2560 Ksym/sec 16000000 Hz 37.5 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Though not same model# there similar in nature. The 1200 has 4 WAN ports. Mine also has a attenuator on the back of the coax connector. Tech said there line was running a bit hot so he added it a while back when I upgraded to the 1G service.
I would have the ISP check the line and ask if the power levels are good for this modem.