Take a good look at the screen on an unused video input to see if you seem them(a dark room works better).
This could to my thinking be either dust (based on the brand/model posted here-let me know if different) on the optical lens this set uses OR a defect in the optical light engine.
Also, I am aware this model does have software upgrades for different issues----when first out we had them and had to go to the site and download upgrades (two of them) and manually install them with a computer into the set---issues then were wrong colors and even lettering backwards........
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