It really could very well be bent rims even though you don't recall anything special.
My score is 5x bent 18" oem wheels so far with my G30 530e. 1/4 out of my (non-RF) summer set and 4/4 out of the (RF) winter set. I got pretty good feel of what broke the summer set wheel, but all others are complete mystery to me.
And this is without any tire damage
