I've had a problem with my Tivo (UK model) in that it will not wake up when I press the remote. Recently it has been responding if I pressed the remote for a minute or two and would then work normally for several minutes thereafter. Later on it would go back to being non-responsive. Remote control seems to be working (I can see IR in my camera screen) and is a recent (1 year ago) replacement. Have an upgraded HD in the box. Anyone have any ideas? Is this a problem with older boxes? Thanks.