Okay I have cooked over 20 pork butts in the 3+ years I have had my egg. I prefer to do it low and slow for about 20 hours at 210/220. I use a cyber Q to hold the temp. Well after lighting it, I left the top open on accident and the temp climbed to 280. after realizing it it completely closed the top as i normally would. The egg held at 280 for almost four hours and would not come down. The cyber q fan never kicked on so it is not a problem with that. I finally took the butt off for a few hours as to not over cook it. Put it back on at about 2 am and egg was still at 270. At 10:00 this morning it was steady at 210. At 12:00 i checked and it was almost out of charcoal so i added some more, about halve of the fire box. 20 minutes later it was up to 275 again and would not come down. It still looks like it should and is ok, but I can't figure out why all of the sudden i am running so hot and cant get it down. Any ideas?