I've emailed Jan already, but I'll post the short version here in case someone else has similar problems.
The most common cause for something like this would be either a sticking relay or a malfunctioning thermocouple. Either the output relay in the controller itself, or the main power relay leading to the elements could be sticking and causing the elements to intermittently get hotter than they should. A bad thermocouple could do the same, and have the added problem of not giving an accurate temperature readout while it is happening.
These are the first things I would look at.
Brad
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