I have an akz451/wh/01 and after it has been on for a while it tends to 'freak out'. This happens most often when I want to run the oven for a long time or on a high temp (200+). The oven works fine for awhile, but then the display starts flashing and the sounds like it is cutting on and off. If the display flashes quickly it never turns back on. When it flashes, the temprature 'dashes' (which show whether the oven is at temp) drops back to one bar, then as the oven switches back on fills up before the flash starts again. Sometimes the temp drops back to 160 but this mostly happens if I try to touch an of the controls while the unit is flashing. I'm wondering which part is likely to have gone, the control board, thermonitor ES659333 or the thermal limiter (ES656403)?