MOCA started being disabled regularly for me last Tuesday (around Dec 14th or 15th, 2020) - before then, MOCA over COAX worked great. It seems to be disabled now more than once per day. I've been meaning to contact support because I use MOCA for my wired connections and spent money on additional equipment to get it working.
A majority of the people complaining here are referencing the issue with MOCA on the Technicolor CGM4141 being regularly disabled since September. My hypothesis about why mine lasted until December is that my model is different: CGM4140COM v2.2.