Is there a Cisco tuning adapter involved with this? Is so, please see my current sig for some important information on Cisco TAs, MoCA, more uses for PoE filters, and possibly the solution for your problem (I hope).
In case my sig changes: "Cisco tuning adapters should never be used inline (using the TA coax OUT port) to connect a TiVo, if MoCA is in use. Use a splitter w/PoE filter on leg to TA, use other leg for the TiVo. Enjoy!"
As of 03/13/15
I'm going to put all things TCF on ice, or back-burner, for now (could wind up being for the foreseeable future).
I may still post from time to time, until it's just not possible, at all, and might not be able to follow-up/through with posts/PMs.
My time/focus needs to be elsewhere. PMs welcomed, but responses not guaranteed. In need of a miracle.