This is not a unique problem with your ST-2000XCM taking bias and dark frames. The same thing happens with the release version with both STT-8300M and Canon 6D cameras, but only when taking bias and dark frames. There is another very long topic going back months covering this issue. For me and apparently others, the issue can go away completely if you put a delay of 10 to 20 seconds between frames. Your description exactly matches what happens for many users. Other users with the same cameras never report this, so it seems to be an unknown random factor, but easy to deal with.
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