How do I prevent this? Was in the middle of grilling some brats yesterday. Went outside to flip them over and no gas, just erratic hissing. I tried to relight the grill and barely got any flame. Threw on another LP tank and got the same results. It's been in the low teens to mid twenties here. Is it freezing because there is no vent? I've never had problems with the smokers regulator in the winter, just the grills.