It sounds like moisture to me as well. I may have missed it but have you tired putting some cardboard or something around to create a simple enclosure? That used to help me print and stick a lot.

Going a little off topic, I'm kind of in the same situation as @DrMacZed but a little ahead of him. The extruder mount I used for my Maker Farm was the Itty Bitty and a few years ago it split. I unfortunately had not printed a spare so my machine was kind of out of order. I recently gave it to a student along with about 25-rolls of filament. I didn't want to trash it all but not sure it was even usable. I told him to dry it out well and it might work. I've purchased a Bambu P1S that's 1.75mm so I had no use for the filament. Once he gets the printer working I'll be curious if he has any adhesion issues from moisture still in the old filament.