Every time I try to do a long smoke my pellet grill flames out between 3 and 4 hours into the cook. My P setting is 4, outside temp is 72 degrees. The pellets are fresh Pit Boss competition blend. I clean the grill completely between every use long or short. I can not get any answer from Pit Boss to my question and I hope someone else has an answer to the issue. I am very sorry I bought a Pit Boss they don't seem to care if you need assistance or not. Yhanks.