Projector out of warranty, was deep cleaned during summer holidays. Work'ed fine up to xmas but now turns itself off after 10 minutes instead of the 20 minutes it's set to. The warning light isn't on just the red light that flashes until you can switch it on again. I've cleaned the filters turned the fans up to 'top' speed to no avail. It's almost as though there's something wrong with it's internal timer.

Any ideas?