This sounds like a panel issue. Cost out of warranty get folk upset. If you are out of warranty (OOW) then extend that warranty before calling it in after the waiting period (varies with maker but most won't let you claim for 30 days after extending the warranty)
Can anybody help me with this problem, two grey patches have appeared on the screen you don't really notices them till you get a solid block of colour in the background. They come and go but the on on the right is there most of the time now.