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i'd be very suprised if it was caused by an EMF since its getting darker as it rotates, then snaps back, and it sounds like its happening uniformly, i stil think its a fault with one of the head or calibration boards, its hard to diagnose without seeing it and or poking around inside it with a scope.
Couldn't find a manual for it online, you might want to call around local shops and get a repair estimate, often its a lot cheaper than you'd think.
A lot of stores will take it back sans receipt for a repair, just not a refund, viewsonic themselves might warranty it.
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