Proline S/o – ef 7000w/1

This m/c works fine most of the time but will just cut out on it’s own when hot. I’ve checked what I can and all seems ok. But there are 2 sets of button stats (1 – grill + another oven side) The square one has no curcuit and the round one has .5 Both sets are the same ?? Could it be the oven set faulty or maybe something else ?? Brett