My Samsung box locks itself in standby sometimes when i get up in the morning, it did it on my old samsung and it does it on the new Samsung box.
Both different Samsung models, unplug it wait 30 seconds and plug it back in and i'm good to go again! (The Samsung i have now is the newer model)
I also lose EPG in the mornings and i suffer from picture freezing and blocks like you get on sat when you have bad signal!