I have a panasonic 50 inch hdtv, purchased two months ago. modle no. PT-50Lc14. I recently noticed static build up noise when viewing tv. e.g., when vewing a program and screen changes to a commercial or goes on to next programming, I will here static and some times see it in the screen - single lines at times. What to due to prevent and will this damage pixels. please help -- thx.