I have a Anthony Worrall Thompon Electric Oven model mm60106AWT I have replaced the cooker element and main control switch about 10 months ago, the oven keeps shutting off completely during cooking, this however only appears to happen when it is turned up to and over 150, i was advised to replace the main thermostat and the limit thermostat which I have done, but this has not solved the problem, when the oven shuts down it only does so for about a minute then comes back on however this will only work if it is kept below 150 anything over that and it shuts down about every 5 mins so therefore the temp has to be lowered in order to use oven. I am completely lost.

I would be grateful if you could help me on this matter, kind regards Paul.