I have a standard old school Skutt with a kiln sitter but not really old, from about 2005 or so, just not computerized. It normally runs like a champ and no issues with the elements. I belong to a large co-op but probably do 10 or so loads at home so it doesn't get heavy use as I fire most of my work at the other studio. Of course I have a show this week-end and was ready to run one last load through since I sold quite a bit at my co-op sale. For the first time my kiln tripped the breaker when I turned it to high, but not right away, about a half hour in. This is after I had it on low for an hour vented and then on medium for at least another hour with no issues. When I ran it on high it tripped the breaker after about a half hour. I re-set it and tried again and had the same issue. I didn't want to keep trying as there must be a more serious issue though I can't understand what would be causing it to trip when the temperature goes up. Anyone have any ideas? I may have to call in someone to fix if I can't figure it out myself.