How can I fix my Neff U1461 oven?

My oven seems to trip my house electrics when set above 150 degrees C. Everything works fine below this temperature, but as of recently it just takes a minute or so for the power to trip if I set the oven even a few degrees over 150. Is this a fault you've encountered before? If so, is it the element? I think we bought this oven 8 or 9 years ago so maybe it's time for a new one.