I'm after some help, solving a VERY frustrating problem with my Pioneer 502MXE plasma screen. Recently (the last 7 days or so) the plasma will persistently switch itself off a few minutes after turning it on from cold. It goes into something beyond "Standby", as I cannot turn it on again by just using the remote. I have to unplug it and wait a couple of minutes, then plug the mains back in again. I have to do this 3, 4 or even 5 times before it decides it wants to work "normally", which it will continue to do so, for many hours after this. Any ideas what could be causing this? And yes, I have - it's not covered in there!