I'm smoking some ribs today and have run into a problem keeping the temperature up. Actually, the termostat seems to work properly but the temperature reading is showing temp in the 270s, although the Maverick shows 219 right now. So I have to set the temp to 275 to get the element to go on, and then it shuts down after a few degrees of rise, thinking it's at temperature. I opened it and let the temp drop a few degrees, but I still got a reading of 265, so the element is still shutting down after a brief rise. Luckily this didn't begin until I removed the ribs to foil them. That's when the problem started, so they are just about done. Is there anything I might do to cure this or do I need a new control?