Freeview,seems to be going silent,and i have to change channels to get sound back, also the sound does not synchronise with the people talking.
Another problem, when in standby, the clock appears, but for some reason,the thing switches to ON, after a few hours even if the TV is not on.

Is your region going through the switchover at the moment? Ours went like that for a while when they were turning all the analogue stuff off.

Restart and check aerial connections. Maybe retune if you havent done it for a while. they chop and change all the time.

Channel 5's audio sync is sometimes awful. which is good as it means its even more unwatchable..