I'm new at this and am using a small UDS made from two ten gallon drums welded together. Before I started smoking with it I seasoned it by getting it up to 350-360 for about an hour and then took the temp to 225 just to see how well I could regulate it. It worked great and I shut it down after about 5-6 hours. The first time I actually smoked a shoulder roast and it worked fine and help the temp right at 225 with very little adjustment but after about 5 hours the temp dropped to about 200 and I couldn't seem to get it back up even by opening more vents. After I shut it down I checked and there was still charcoal in the basket. I used the minion method so I don't have to open the smoker to add wood or charcoal. I'm wondering if the grease dripping on the coals is causing my problem and as the charcoal level gets low the grease is drowning out the charcoal? Any suggestions would be appreciated. So far this the only problem and the roast still made some great pulled pork. The only thing is smoking is interfering with my golf. Can't do both at the same time.