Yesterday I did a brisket. Had the egg up to 225 dome. Attached the DigiQ and set the pit temp to 225 and the food temp to 185. All seemed well. The DigiQ kicked in and before I knew it the pit temp was 247 and the darn thing kept alarming. The brisket temp went to 165 in no time however it did stall at 170. What did I do wrong?