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Yep, first test (after removing obvious interfering devices) is to move it several feet from its current location. Ideally, rotated at least 90 degrees. Stay away from walls. If it still does it you probably have a defect. If it stops you're dealing with interference. The stuff laser mentioned, air conditioners, refrigerators, anything with magnetic characteristics. Large electric motors are very bad this way. Maybe on the other side of the wall?
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