My Vu+Duo has developed, over the last six months or so, an intermittent fault where a program I am watching goes off and the "SID not found in PAT" is displayed on the screen. Prog up ,prog down on the remote brings the program back. This also happens during recording making the recording annoyingly incomplete. I have got the latest BH image installed. Has anyone any idea what causes this and how can I cure it?