Started a butt Friday for Saturday eating, cooked a couple slabs of ribs while the butt was still on, on Saturday.. Took the ribs off and my wife decided we needed another butt so I kept the smoker going and through another butt on.. I just had it at 225 overnight and kicked it up to 250 after I got up this mornin.. At 1 this afternoon the butt was up to about 175 and I was gonna let it go another hour or 2 and get it on up to 185-90.. Well I come back and check on it at 230 and the smoker had done got up to 350° and the butt was at 208 internal temp! Glad I got to it in time and salvaged it!

Anybody have any clue why it would get up to 350° like that? Highest I've even seen it was 276 and that was with it set at 275!