AEG B4101 – 5-M Oven turns off while cooking – comes again after 15 mins turned off

Hi,

My AEG B4101 – 5-M built in oven, switches off while cooking something, nothing then works including the light apart from the clock,

then after switching it off for 15/20 minutes to cool down, I can then turn the oven back on and use again with no problems (in fact for over 12 months with no problems).

but, I was stood near the oven yesterday while it was on and heard a strange sound like a fan slowing down when I looked the oven was off again, 20 mins later it worked ok again.

Does anybody know if this is a easy fix (I do have some experience electronics etc) and which part will I need to repair it?
or will I need to call out AEG?

Any help would be much appreciated, Thank-you.

AEG B4101 – 5 – M

Typ: 91 ACD 01 GA
PNC: 944 181 198 02 3.5kW
S No: 95144452