How long did it work before the moca dropped? I've seen poorly terminated cables jack up moca. I've also seen susceptibility to all sorts of rf interference mess with moca as well.
I feel the OP did all he can and needs to make a call for someone to help him out.
I put RF connectors on for 35 years. Not long ago I was fooling around with my OTA stuff and wondered why my reception was so bad. Guess what? This so called experienced tech (me) folded over the center conductor of the RG-6 to the splitter when inserting it causing a direct short. OTA good now.