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This is also a problem that others have seen and only comes up with reflections off very bright stars. Fortunately most images don't contain such stars, however the exception is Alnitak when imaging the horse head nebula. I used to have this problem with my Qhy8 ( original model ) and the way I got rid of it was to shift the ir filter on the front of the camera out another 40 mm and this dramatically reduced the reflection off the ccd which was bouncing off the ir filter and back to the chip. Quite easy to do with a T spacer from Myastroshop I believe.
Glad to see that your dark comets have disappeared. Well done.
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