I started the smoker at about 4:00 am this morning to do a 10lb butt and an 8lb brisket. everything was going super, the first rays of sunshine coming over the mountains were shining through the thin blue smoke. I was listening to the early morning birds having my third cup of coffee when the temp crashed on the smoker, oh no I must be out of propane! I switched to the back up bottle and all was well for about 20 min and the temp crashed again!! NO FIRE I grabbed the grill bottle and tried that (it was low on fuel) and no fire!!! I loaded up the first two bottles and went on a search for propane. who would be open before 7:00 am I caught the manager of the Top Stop as he was getting to work thank god and he filled the bottles before he opened the store. The bottles were only half empty. I got back and the temp was down to 168 got things hooked up and am now sitting down to my fourth cup of coffee and watching the temp rise again. I think my regulator is going bad. But for now I am sitting in the sunshine watching the tin blue smoke. I hope the rest of the day goes a little easier.