I'm assuming everyone's MES is out of warranty?
I ask because mine lost temp last year and wouldn't get hot. Luckily it was when everything was done and I was just gonna dry/smoke some hot peppers--the temp sank from 225 to ambient temp slowly but surely.
I called Masterbuilt and they actually asked where I got it (Cabela's), serial #, etc.
Within a week, they sent me a new or refurbed smoker "shell" which was the main case (my was the stainless version), LESS the door, grates, display, wood chip chute, drip pan, etc. I just transferred all my parts to the replacement. You don't even have to send the old one back!
If yours is within a year old, try it. Or even if it's rarely used, try it.