hi i have a sony VPL-CXI. About 3 years old, one of those ones which were on special from PC world. The problem is, after 2 or 2.5 hours of use it shuts off. A light fllashes, saying somethin about over heating or the fan. I can't remember exactly what. I phoned Sony prime support, who said I should take the filter out and clean it in warm water, before drying throughly and replacing. Also run a hoover lightly over all vents. Will this work ? Or might there be a problem with the fans ? all the vents are well away from walls etc. It works for medium length films fine, but occasionally I want to watch longer films... Any ideas ? Thanks!