Sounds like the problem I had last year [look for thread] with my TiVo re-establising the HDMI link every couple of hours or even more often and picture and sound cutting out for a few seconds. The TV would then display it's channel information as though I had just connected a new piece of equipment, meaning that the HDMI link was definitely interrupted. Once the picture was back if I skipped back on the TiVo, none of the recording was missing.
I tried all sorts of things and it found it improved when I connected my arial directly rather than through a surge protector but still happened a few times but I have just realised realised that it hasn't happened for months now and seems to have corrected itself. Or maybe it stopped after I bought my yamaha AV receiver with HDMI throughput. I wish I could say for sure.
Anyway, there is some hope as I had the problem and somehow made it go away.