I have recently been experiencing problems with the digital optical output from my Pioneer DVR-5100H as the digital signal seems to drop off for a split second giving a blip in the audio playback. There does not seem to be any pattern to when this fault occurs. It can happen several times in a row or I can watch for a few hours without it happening. It happens whether I am watching a DVD or Sky through the DVD recorder. I have tried connecting the DVD recorder with my other two optical cables and I have also connected up another DVD player and doing this I have isolated the problem to the Pioneer rather than the cables or the amp. Has anyone else encountered a similar problem and if so can you shed any light on it or suggest a solution? Thanks.