I've had my 37" Panasonic Viera for one week and I might have a problem but before I start ringing up support helplines I wonder if I've missed something silly. The problem is that about once a day the brightness/contrast level will suddently dim down to about half the current level. As I'm running the set in I've got the set switched to dynamic mode with the brightness and contrast values set to half-way anyway. So when the problem occurs it gets darker still! If I then select the Picture setup menu then it resets back to full contrast and then I have to alter it back down to half-way. This has only happened when watching Freeview TV - although to be honest I've only watched a few short segments of DVDs so far - I'm waiting for the run in period to end before watching DVDs properly so it may well happen then too. Does anyone know why this might be happening? I really love the screen and I just hope I don't have to part with it so soon after getting it. Thanks!