Occasionally while watching DVD's ( my cables been out so I have nothing to compare it to)a strip appears on either side of the screen. It runs along the vertical edge but does not reach the corners. Its about 1 ft long and appears in orange or green (pale) and is transparent. It dissapears after a minute. Im using a 2 year old Panny 27" and a 2yr old Panny RV-30. It happens with any kind of movie. I got it with Unforgiven rented from Blockbuster and from a just opened Pearl Harbor. Any ideas?