My greatly beloved Barco 808s had a new, ah, feature. After about 15 minutes of use, the screen goes black. If turned off, the picture will come back for a couple of minutes, but then goes black again. Perhaps it is overheating? Hopefully this is something a reasonably resourceful person can fix, since I don't really relish the idea of demounting it from the celing and hauling it out of the basement to the repair shop. Any ideas are greatly appreciated.