When you say the oven cuts out, does it trip the fuse, or does it just stop heating, do the lights go off on the front, and at what point does it come back to life?
Ok so the fault is local to the oven, and then comes back on by itself.
Does the fault occur only when it gets on, and how long does it have to be running before the fault occurs, finally does the fault occur if using the grill or just on the oven?
If the grill cuts out then its likely to be the thermal cut or thermostat the oven which is at fault and causing the oven to overheat and then cut out.
Since the thermal cut out is designed to stop it overheating beyond safe limits.
The next step would be to get an engineer to attend who can then test the thermostat and thermal cutout to find out why they are not working properly, and from there replace the parts.
In most cases a thermostat is around £15
If you would like me to recommend an engineer in your area please provide me with your postcode.
I would highly recommend using AB Appliances, they are local and very reasonable, and customer who we have referred to them have always been very positive.
They charge £55 labour cost (including vat and call out).
You can contact them on 01923 818474
Please let me know if I can be of any further assistance, and appreciate if you can rate the service received today.