When I watch a programme on i-player, the picture and speech gradually lose synchronisation. After a while this becomes confusing. If I pause the programme for a short while then re-start, the synchronisation is back, but again the picture and sound gradually fall out of step. I had assumed that picture and sound all came as a single digital stream, but I guess not. Anyone else suffer from this, and is there any way of curing this mildly irritating "feature"?
Greg