Hi MarkP59,
Thanks for posting!
I'm really sorry for the trouble this has caused you.
We've picked up an issue with the latest TiVo® update. While our team is working to fix this, we recommend turning off the Power Save feature.
To do this, just press Home on your remote control then select Help and Settings, Settings, Devices, Power Saving Settings and then Off (No power saving).
All the best! 
Josh