I finally had a clear night last night. I don’t know if it was a coincidence or not but I downloaded the new SGP release before starting and my camera stayed at- 20 for the whole evening (7 hours). I doubt it has anything to do with the release but that was the only thing I changed. It was slightly warmer last night in the 40sF. The past 4 sessions where it was having problems the temps were in the high to mid 30s. However, I have images in the past without issues below freezing. Hope that helps.
PS in the last image of the night my Auto focus had kicked off and SGP locked up on one of the image downloads and I didn’t feel like restarting everything so that is why I didn’t image longer. Probably good for my marriage though