I had a hunt around various forums yesterday (QHYCCD, SGL, CN and Astronomy Shed) to see if anyone was experiencing similar issues to yourself but I came up empty handed.
I know in the QHY12 manual it wants the 12V TEC power to be inserted after the cables are plugged in , and removed first on switch off. I'm not sure how important this is. But it could be a timing issue with power sequencing.
Bill
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