I'm on my 4th winter with this insert and the automatic snapstat has been working great, until now. I know that this is a common issue. Fans are working on manual, but if I switch to auto they go off. Stovetop has been at about 700 degrees for an hour now. I did make sure to clear ash away from the front middle where the snapstat sits. Wondering what else others have done to fix? Or should I just replace?