Design spot 250 Pro Shutter issue

Just purchased 4 design spot 250 pros and brand new out of the box two of the fixtures when put on strobe you can very loudly hear the shutter touching as it opens and closes. As time went on... 5 or 10 minutes. one of these fixtures' shutter became stuck open and also stuck a different levels. When I reset the fixture it temporarily solves the problem but then soon returns...In all of my audio and lighting years this is the only product to ever come to my door step with DEFECTS! Heat problem? calibration problem? cheap light problem? anyone?:mad:
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