So, haven't had this grill very long. But having issues with this thing staying at the set temperature. Will set it at 200F and will cook there for a while, evidently the fire will go out in the pot and it will cool off to about 105F and relight it's self. And go back up to 200F again. If I set it at 200F it should say there until it runs out of pellets correct? Any reasons on what would make it do that?