I had an issue with my RT340 with temperature swings of 30+ degrees with a 12 hour cook at 225 degrees. I called customer service and suggested I change the auger speed to 20. Also he asked if I was cooking in direct sunlight. The answer was yes and it was about 82 degrees outside temperature. He suggested moving the grill to a shady location out of direct sun. I did and it took care of the problem. The grill is now spot on. Thank you Recteq!!