Recently my smoker Navigator 1150 WiFi starts out holding smoke temperaature then After an hour or so climbs to 350 before I catch it to shut it down. Just cleaned the pot. I have shut it off unplugged it waited 5 minutes and restart in Smoke mode. Climbed to 350 and appears to be dropping. I am afraid to leave it alone for fear it will X climb again. It’s at 287 and climbing again . Still on smoke setting. What can I do?