electrolux oven model eob 5630 x keeps going off ?

electrolux oven model 5630 x
pnc 944 182 598
ser no 33862 335
typ 91 ahb 01 gd
240v 3.0 kw

problem is that oven works for approx 30 mins then oven/fan also the light inside oven goes off,after about 15 mins it will work again for a while i looked on top of oven and found in wiring loom what 1st looked like a connector but found it to be a flat strip of metal with a white cable coming from the rotary switch on left side also close to it there is i think 3 blue cables which ends looked burnt there was no bare copper showing so a bit dubious i am thinking is this a resistor or thermal cut out. hopefully if anyone can come up with a answer to the problem i can buy part that is required.I am a electrician but not familiar with these ovens it would help if there was a circuit diagram supplied.I await a reply from somebody thank you