I ran out of propane last saturday... refilled the tank today-check, prepped my meat- check, wood still soaking-check.. let's fire up the burner-wtf? it's been working great since thanksgiving, except for the one time I let it run out of propane, now it won't stay lit and when it does light, it's a very small flame... it's not very windy out, but the temp is in the teens, could that be the problem?