I have an Acer ph530 that has been working fine until lately. After about 15-30 minuets the projector shuts down and the red light for the lamp comes on. I can turn it back on after it completely shuts down, but he same thing happens again. The lamp only has about 650 hours on it and it is past the warranty. Is there something I can do to make sure I really need a new lamp or can I open it up and clean it out somehow?