Now Playing screen "blinks" every 3 seconds

Has anyone seen this? Lately my Now Playing screen will "blink" every 3 seconds. By blink, I mean all of the words turn off, then turn on. It's kind of a slow strobe. This happens intermittently - I have noticed it mostly in the evening. It occurs on BOTH of my Tivo's when it's happening. Both Tivo's are connected within my home via Ethernet cable to a Cox cable fiber connection (Cox calls it "Gigablast").

It's disconcerting, though not disruptive, in the sense that I can still choose a show and it will come on. Rebooting seems to stop it for a while, but it will come back.

Thanks in advance,

Rob from AZ