watch the element and see if its still glowing red. if you do it in the dark with the lights off you can see it glowing round the fan
if just the fan goes off it may be the fan motor
if both go off then look to see if its got a cooling fan as it should be running to keep it cool
the fan will be like this on probably
https://shop.ukwhitegoods.co.uk/699250094-tangential-oven-cooling-fan-motor
it blow cold air around to stop the case and controls overheating
Dave