This sounds very similar to what The Straight Pipes Jakub and Yuri experienced when reviewing the F90 M5. The discussion about the "snap back" steering sensation starts at around 9min mark. They are in Toronto, Canada so it might explain the cold weather correlation.
I personally haven't experienced it in my G05 40i, but I don't doubt it. My F85 X5M also had a funny sensation where it was so dead off center and felt like there was no return to center. It looks like BMW has possibly over compensated and now the EPS steering setup is too eager to return to center.
For those that are experience this, check out video and see if it matches what you're experiencing.