[cj]

2 things that solved my problems with moca was buying a moca adapter to filter the signal out from leaving/entering the house (adapter on the primary incoming coax) and then another adapter on the coax plugging into your cable modem.

This fixed some (probably modem specific) problems where internet would randomly drop in the presence of moca.

[ryukafalz]

Right, I'm on FiOS so there's no cable modem, and as best I can tell the primary incoming coax line is disconnected.