My diplomat ADP0530 cooker keeps cutting off when half way through cooking?

My cooker keeps cutting off when half way through cooking even the electrics cut out on it, it will stay like that for about 15mins then come back on, I then have to reset the clock for it to come back on, it will start cooking again for about 10mins then cut out again, please help me otherwise. Xmas dinner will be cancelled

Leanne
December 2011