I received a Pitt Boss 820 for Father's day. I have cooked 4 Boston butts. Each time I cooked 2 at a time. After 6 or 7 hours cook all hell breaks loose. Smoke stars coming from everywhere on the smoker. Temp jumps to 375 or higher. Temp set on 250.. I just had to turn it off and let the thing cool down. Meat temp was at about 180. Finished in oven. I think it may have been grease fire. Butts had lots of fat and large fat cap. Any comments would be appreciated.