has anyone had any issues with the backup camera flickering, sometimes it is perfect and sometimes it gets blurry,faint pic, the audio is always perfect and when you switch screens on the monitor it looks ok, i know they had some issues with them but it is put away now and we are taking it on a trip in april and i was going to order a camera if i thought that may be it, just to save time, it only has 8000 miles on the coach, john