Cannon Pearl Duo 10243G gas cooker Cuts Electric !?

Hi, I have the above, its a bit old now but generally works well.

But, lately after I switch the oven on, and say after about 5/10 mins the house electrics switch cut out. I did some investigation and definitely the oven casing the cut outs, happens as I say after a few minutes, or after a few mins and I increase gas over power or switch on the Duo button, any ideas ?