Intermittently (about once a day) we will be watching TV via our Tivo box and the TV screen will start to flash off and on again. (It must be noted that the TV does not do this via console or firestick and we have swapped HDMI ports). To resolve we restart both the Tivo box and TV.
I have ran tests via the VM website. it gets to about 40%, jumps to 100% and it says 'Technical issue' and 'Your TV box needs to be rebooted' - which has been done (powered off for at least 5 minutes).
We have a Virgin Media TiVo HD Set Top Box - 500GB.