Unstable connection with Netgear CM1150V modem

See attached Download locked channels part 1

@EG See attached Download locked part 2

The upstream power is too high / out of spec That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

Good luck with it !

Thanks for your reply.  There is only a single split from the street to the modem and that was installed by Xfinity.  Since the problem never occurred for 2 years with the Xfinity modem, I think it stands to reason that it's not the cabling.  If there are no other leads I will likely go back to Xfinity and replace the Netgear with Xfinity modem.

It's a line impairment. The signals don't lie. And a line impairment issue will still be there no matter what modem is used...

If there is nothing that you can do to improve the connection quality then you should get a tech out to investigate as was stated.

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.

Good luck !