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Hello to all, Maybe you can help me this issue. I am currently getting some strange dark pixels in my exposures, like an "bug swarm" pattern. They only appear on the first few exposures I take, and disappear later. Last night, I was taking 15-minute exposures @ 0 degrees C and this artifact was present on the first three frames but disappeared by the fourth one. Any idea what could this be? The attached screenshot shows a 200% zoom region of one of my uncalibrated lights with those black pixels. I should note that they are difficult to remove during processing, and since my guiding is fairly good, they remain after stacking. Please help!