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!"
TiVo is dead!... Long live TiFaux?...