My 10 month old lx5090 displays what looks like a black mountain range, top and bottom of screen. This only happens when the set is switched on but only if it has been off for more than a couple of hours. It disappears in a few seconds, longer if it is cold. It does seem to be temperature related. Other than that I am delighted with it but I'm a bit concerned that it may have a fault which could progressively worsen. Would appreciate any comments.
PS. I have attached a picture of the offending "mountain ranges"
PS. I have attached a picture of the offending "mountain ranges"