Over the last few weeks I have noticed almost all of my recorded programs have regular picture issues where it breaks up before coming back and I have now started having programs not recording at all due to no signal when I look at recording hiccups.
Seems to be another bug introduced in the 2015 update, where Tivo doesn't always wake up from standby. Seen it reported a few times now. I usually notice there is no red recording light when there should be, if in standby. As soon as I bring it out of standby, the recording starts.