electrolux single oven

model eob 6630x
pnc 944182604
problem. oven cuts out all heat and fan after about 35 mins and resets and does similar thing again

on test heats up at various temp settings cuts out cuts back in.
have not spent 35 mins on site customer advised timeline

can’t find thermal cutout loop certainly in top and rear of unit

i suspect timer relay is problem.
just asking if overheat cut out may be problem or is the cost out loop in side casing panels

although it appears not to overheat
all fan and stat/ element connections are fine

any help appreciated
graham
leicestershire