I can`t answer this particular problem but a useful starting point with any obscure fault on these modern electronics is a full "reboot.".....So if you have the Security Code for the player , then remove the battery connection (or fuse) for 5 minutes, replace it and enter the code...Then hopefully it should be OK. I`ve seen this cure a number of odd faults so it is certainly worth trying.
RegWorts
May 2008