I have a TiVo v6 box and it has started to lose the picture (just see a black screen). I still get sound.
This is happening intermittently when I turn on the tv but once it’s happened it requires a reset of the TiVo box in order to fix it. I am having to do this at least once a day at the moment.
I am regularly seeing the issue with normal TV and often also on apps like iPlayer, Netflix and Amazon Prime.
After reading some posts here I have tried a new HDMI Cable (ultra fast), a different port on the TV, setting the TIVo video output to also have 1080p selected (tv is Samsung 4K). None of these have worked, I still regularly get the blank screen when I turn on the TV. This actually happened on first install but after a few hours I tried it again and it has been mostly ok for a year. Now it’s happening every day, sometimes multiple times a day.