have a cs-25 that’s around 1 year old, give or take a few weeks. Yesterday I was trying to smoke kielbasa at 180f and part way through the temperature took off to over 280. It looks like I have no control over the temperature. I tried it this morning with an empty oven , set it at 180f and 20 minutes later it was reading 264 … I verified with a temperature probe that it was indeed 264f. Any ideas on what might be wrong? worst part is I think I screwed up 12 lbs of kielbasa !