said by MagicalPig:Yea what knarf829 said. That is normal.
However I have seen it occasionally do it other times. When I have seen it I have tried to change the channel (from the box not the remote) and it will have a delay (longer than the usual delay). I suspect the box is resetting something causing the channel number to pop on. It usually happens in clusters for me over the course of a night. Then it wont do it for a while, Rinse repeat.
I think this is actually what I've experienced.. I've had the box about 1.25 yr now and it's always done it.. 
