Nighthawk X4S C7800 randomly dropping WiFi (will not connect)
Hello;
I purchased a Netgear C7800 cable modem/router about 6 months ago -- the two months, it randomly drops either the 2.4 Ghz. or 5 Ghz. wifi channels. This started as an occasional burp, but it's up to daily now -- well past the point of being annoying. I find that usually the signal drops, and then either goes away, or comes back -- but then says that the password is invalid. I have to reset the entire modem to bring it back. When it "goes away", it also seems to be broadcasting -- but about 99% reduced power -- if I take a phone in next to it, it shows a very low signal a few feet from it, however it is unable to connect.
The devices on the network include 2 Nest cams and a Nest Hello doorbell, couple Android phones and some iPhones, various MacBooks, two HomePods, Apple TV and an R8000 repeater in the garage.
Signal levels look fine in the -3 DB range with an SNR around 42 -- can't find any errors in the logs. Nothing appears about WiFi issues, and the router shows everything is connected. Comcast has resent reauthorizations to the modem, played with the config files etc to no avail.
It seems like I can't find much information about this modem online -- I have found someone else who seemed to have this issue and didn't resolve it, even with replacements. Netgear units used to be pretty reliable, but I replaced a C6300 that had the Puma chipset bug which popped up majorly when I installed the Nest cams -- with this one, which has a Broadcom chip -- and it was fine -- until now.
