Switching picture off when playing dvd?!

I own a LVW5045 and have had no problems in past 2 yrs up until now.
The problem is when i put in a cd and press play it tells my telly to switch off its scart input… I have just only recently noticed this problem but that is probably because i dont often watch dvd… It is fine on playing back the HDD.
Its annoying because i have to get out tv remote and reselect the AV/scart button. I have a modern hitachi tv i have replaced scart leads its not them. Tv and lite on settings are set correctly ie. scart/rgb setting on lite on. I have the latest uk205 firmware installed. Any Ideas on any fixes appreciated as its giving me a headache