It does have a sleep mode but I keep that switched off, an it does also have a inactive mode which gives me a pop up saying that it's going to shut down unless I click no which I do, but these shut downs are totally random, today I had maybe 3 shut downs within around 5 mins of one another, so not enough time passed to trigger a sleep or inactive mode
The wires all seem fine an I always keep it clean behind the unit so no wires are tangled or pulling on one another
Sometimes when I put the TV back after it's happened I get some warning about it can't continue the recording but I've no idea what that means, as far as I am aware the TV can't record anything
I have a feeling it's developed a fault but I've no idea what fault it could be an if I can fix it