diplomat apl 3201 Ix keeps cutting out

Hi, I have a diplomat apl 3201 Ix which keeps cutting out. The oven cuts out at any temperature. After a few minutes it switches itself back on. (About 6 months ago we had a similar issue of the cooker cutting although it was because the thermostat was broken and the cooker would reach the maximum temperature and then cut out because it was too hot. Since the thermostat has been replaced it has been fine.) I assume it is not the thermostat this time as the cooker cuts out at any temperature now – 150, 200 etc. Does anyone have any idea what is wrong and what I need to buy to fix it?

Thanks,
Ally