@Tony This was a case of "Don't assume everything is code or configuration-related". It turned out to be an intermittend AC socket that distupted the modem and it's embedded router (when on). It all...

Just installed 2 pack of Deco M5 AC1300 v3.8 to replace the router on Netgear C3700 cable modem/router. Got fully configured and then turned off routing on the Netgear. Configuration: Modem --> Deco...