Sounds like the colorwheel. the bearings are starting to go on it due to excessive dust and heat. since it's a motor, it's bound to wear out eventually. it will need to be replaced. you could buy the part and do it yourself or send it in for repair. either way, try av solutions in ny. they're really good and they're an infocus service center. www.avsolutionsny.com.
the lamps should be good for 2000 hours. if you use it that much per year, three lamps is normal. but it's best to keep the projector clean and free of dust to extend the life of the lamps. dust keeps in the heat that the projector is trying to expell. heat will kill the lamp and possibly overheat other circuits and components. use canned air to blow it out.
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