Hotpoint fan oven cuts out...then comes back on

[xpeterpx]

Hi all. Hope someone can help
My Hotpoint SH 53 XS built in fan oven ofren cuts out as it overheats then if left for a period of time switches back on again. When this happens the cooker completely shuts off including the timer/clock
My first thought is the thermostat at fault but there is also a thermal switch in there too.
Any idea on pinpointing the issue so Im not buying and changing parts uneccasarily?
Thanks for any advice
Pete

 

[Lower]

It’s probably the cooling fan for the electronics that has failed.

 

[xpeterpx]

I should have mentioned that it only does this mid cook - does this still sound like the case?