Netgear CM1150V Internet Connectivity
Bought a Netgear CM1150V Cable Telephony Modem to accommodate my new Xfinity Gig Service on 8/26. Had lightning fast speed (945/48) for about 10 days until internet connectivity began to falter while streaming Xfinity TV on my tablet. Internet speed went down to ~1-5mbps/0 mbp. Rebooted and factory reset modem and router a million times. Xfinity tech was out 3 times and each time said line was all clear, no issues with others in my area. Xfinity even laid a new cable line from the node to my house. Still, same conncetivity problem. Brought it to the attention of Netgear. Downstream bonded channel power is between -1.1 and .8 dBmV and upload channel speeds are 47-48.5 dBmV. Event logs consistently show "critical" priority issues with messages: "Started Unicast Maintenance Ranging - No Response received - T3 time-out" or "16 consecutive T3 timeouts while trying to range on upstream channel 1" or "Unicast Maintenance Ranging attempted - No response - Retries exhausted." So Netgear sends me a replacement modem. While waiting for the replacement, I reinstall my Arris Surfboard SVG2482AC. Works fine with consistent internet. No problems. Netgear replacement CM1150V arrives, I call Xfinity to assist with installation this time. After an hour with tech on the line and several reboots, the modem is successfully installed. Two days later, I am back to where I was with my initial modem. I now have inconsistent, mediocre internet service. When it works, this modem is incredible, but when it is not, it is tortoise slow. If it gets worse, I will have an expensive paperweight in my office and will reinstall the Arris Surfboard with the hopes one day it will be fixed.
My point: I am convinced Xfinity and Netgear need to refine the interface between the physical product and the service because it clearly DOES NOT WORK, at least not consistently. I anticipate the day when a new firmware update will resolve this but it will take good faith cooperation between the two companies to fix these bugs. I am hardly alone here as I see the same issues with others in the Netgear and Xfinity community forums. Any input is welcome. Thanks.