The last night went without troubles.
Now I remember that the first successful night was a few degrees colder than the subsequent failure night. Maybe indeed the camera cooler was working too hard to reach and maintain -20°.
This night I powered the camera directly from a 10A power source, and reduced the target temperature to -15°. No issues at all.
I'm happy.

Don't know if it's related to SDK, probably not. But I did upgrade the libraries

> 8GB version
I've always wanted it. I remember I got the 4GB version only because 8GB version was out of stock.
Checked all the shops, ... and it's still out of stock. I'll keep looking.
Thank you for the suggestion.

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