Got the heater an it’s doing work.. insulation is next.. I wanted to get insulation first but I seems like I need a quick band aid until I canTotally. The cupping of the leaves are not just on the top, but all through it. It's going into hibernation mode. The first pix didn't show that.
Crank that heater up and get some insulation in the garage. You're going to have this issue until you do.