Advertisements when you get absolutely no channels and the message:can't find signal. I've not had this happen over the years and yesterday and today my XL4 and Roamio both got it. I had to get refresh signals from Charter for both. Fortunately, they have an automated system where you just say "refresh" and it is sent. I assume that this is some shenanigans by Charter that messes things up since it happened to both my units although not at the very same time. Also, I was rather surprised that I couldn't get ANY channels to tune in. BTW, I looked at diagnostics and all the channels were good strength and locked, but not showing up on the TV.