I have a G36 I bought a little over two years ago that I use with Comcast. I haven't had any issues with the modem. The only previous issue with connections turned out to be a cable that got damaged by my neighbor. Comcast replaced the cable and all has been fine.
Today it lost connection but the light was still blue. If I disconnect power and reconnect, it will work briefly but then drop connection again. I have 3 devices connected via ethernet and a bunch on WiFi. I've disabled WiFi with no change. I also disconnected each of the ethernet devices individually with no change.
Comcast doesn't detect an outage in the area and their AI support says things look good to my modem. It can reset it successfully and see when it's not online if I disconnect it. Gateway FW version is [edit personal information] NCS
Anything else to try? Hate to have to shell out for a new one when it's only a couple years old.