I bought a Hitachi 42PD 7200 plasma 16 months ago and an intermittent fault has occured (see attachment). 6 vertical columns have appeared on the right hand side of the screen, these come and go but have been known to stay on for a lenghty period. Comet have the television at the moment but cannot pinpoint a fix. I was just wondering if anybody has had or heard of this problem?? Any help would be much appreciated, i'm beginning to think i'm the only person this has ever happened to!!