I had a thought. After making adjustments to keep and maintain a steady temperature, I finally ran into the "trying a different pellet" thing. I had picked up a bag from Costco that I thought I'd try since I was running low on pellets. I let the hopper run empty, while still having pellets in the auger area, I filled the hopper. A few minutes went by and the temperature started to rise. At one point reaching over 100 degrees higher than the set temperature. I turned off the grill and I took a trip to the closest place I knew that had pellets for grilling, Ace Hardware, and picked up a bag of pellets made by Weber. I removed the old pellets and dumped the Weber Pellets in and fired it up. The Temperature ran high for a few minutes burning the leftovers but fell and maintained the set temperature of 225. Problem fixed. So my thought was to have a place to list everybody's experience with what pellets burns too high. This is what I picked up at Costco. It might be a good brand but it made my grill run hot.