This is a very common problem with this projector, and the Mitsubishi EX200 and 240. Same lens and projector manufacturer, I believe Coretronics. The problem is the lens itself. Why they fail over time, I don't know, but I have replaced several of them. You can try DEX, who supposedly sells Infocus parts, but everytime I try to get them from DEX, they either don't respond to my emails or phone messages, or don't have the lens. Right now the only place I can get them is from Mitsubishi, and I don't know if they will sell to you if you are not an authorized service center. By the way, if you get a new lens and it is still out of focus, don't assume that the new lens must be good. I once had a shipment of three new lenses from Mitsubishi, and they were all bad.
