Ok so I went to bed at 1 am and smoker was holding at 271 nice and stable. Woke up at 5 am and smoker had went down to 150. I checked internal meat temp and center was 140 on the nose. Quickly resolved the problem and smoker back up to 230 within 30 minutes. So my ? Is this butt should be l right? Looking at it from a safety stand point. I am thinking there is a cat or something like a raccoon causing this problem. My top damper was shut. The last time I did this temp shot up to 300 I caught it just in time and my vent was opened up a lot more then when I left it. So something is playing games cause I have done this many times before with same smoker and no issues and setting on vents are changed both times when I get up to check. Anyway temp in center was at 140 I am thinking temp could not have been low on smoker that long and this butt should fine. Any advice would be appreciated. Thanks.