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Hi Geert,
You could try and cool down the support electronics with a can of freeze just before the 30 minute readout happens. If it improves the noise you know where the problem lies.
There is also corrosion to consider as well, my 3 yr old QHY12 had to be sent back to China for repair because the printed circuit board tracks were corroded and I was getting severe horizontal banding across each image.
Cheers
Bill
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