Belling Format Electric Cooker - about 10 years old, not sure which model i?

When I used the cooker whether it is one of the ovens, grill or hob after about 30 mins use, the whole cooker cuts out as if the electricity has been turned off. After a couple of hours the cooker would come on again. I used the hob last night and it cut out. Now it is not working at all. I have had an electrician in and had the electric cables checked and he said there is not a problem with the electricity but with the cooker. I live in Greece and have been unable to find a repair man. Please advise.