My mother-in-law's LG TV has suddenly decided to stop showing Maori TV, Prime, Trackside or Choice on Freeview.  She can still get Prime on the analogue tuner, but not on the digital tuner.  The EPG still comes up though - just no picture or sound for those channels. 

I've checked on my Panasonic TV and Blu Ray recorder, and we can get everything.  We both live in Palmerston North.  So I don't think it's a broadcast problem, or an antenna problem.  We've tried re-auto tuning.  Any ideas?