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I am considering purchasing this projector. I have 2 optima ep721 projectors that both developed white dots/dmd chip problem, the second of which just developed the white dots last football season. I have seen a number of comments here on the white dots/dmd chip problem. Is this inevitable with this type of projector? Or is it a defect? How many hous of life should be expected of a dmd chip. What class of projector is necessary to avoid this problem? Thanks.