What's going on with my Freeview? In the last week or two I've noticed that periodically (usually early evening) the TV picture breaks up to the point that it's unwatchable - but only certain channels are affected - notably TV1, TV2, Maori, TV6, TV7, all showing between 70% and 70% signal strength, the remainder being fine. This period of unwatchability lasts half an hour or so, then just comes right.