Wireless TV Box - MoCA issues

I had wireless tv boxes set-up for a year and working great.  However about a month ago issues started. After numerous visits, the problem is that the MoCA is periodically disabled at that modem. re-enabling it means wireless tv will work fine for an minute to 12 hours, but just eventually will be disabled again at the modem.  Everyone is apparently clueless, since the sure “fix” never works.  What is the issue?  I keep thinking the central cox network is sending a signal to disable the MoCA, but no one will confirm.