I have the Widescreen Panasonic TX32PG30 (Nicam only) as I use separates for the surround sound. The problem is that every so often a coloured smudge appears in the bottom left hand corner of the screen. It is usually bright green, but sometimes mauve. Turning the TV off, and then on again immediately usually clears it, but it is very annoying. The set is about 6 months old, should it go back? Is anyone else having similar problems? Why does it do it? Advice please.