I think the issue has to due with the material corroding. If you keep the bead nice and clean every time a tire gets changed the issue will not happen as much. I have aluminum wheels on my Lancer and I've only had to put air in one wheel twice all winter. That wheel was repaired at one point due to a crack in the bead area on the backside. The other 3 wheels have maintained proper pressure all through the temperature swings, but I thoroughly cleaned the bead areas before tires got mounted.