BenQ PB8220 DLP Projector

I have had a PB8220 for about a year, I have sent it in at least 4 times for repair, tried replacing the bulbs for $350 a pop, but that doesn't help. The last time they sent a total replacement, rebuilt, and it didn't work right out of the box for longer than 5 minutes at a time. The problem is the lamp light keeps coming on and and it shuts down. It will operate for 5 to ten minutes no more. Sometimes when I get it to come back on everything is blue. I am very frustrated, at this point, I think there is a major defect in these units. It seems their plan is to keep sending me junk (bad ones) until the warranty runs out then I'll be stuck. It's funny there isn't a class action lawsuit regarding this model.