Anyone experience this: Pork butt (all of 5 lbs) is on and after 3 hours is hitting 145 degrees. Is it running away? Grill temp is 220-225 on average (a couple of spikes, but minor). I seem to recall this happening to me once and at one point the temp slowed to a crawl but I don't remember the time frame. I am now starting to keep a log of this stuff so I don't forget the next time.