my grill on a new world gas cooker keeps going out when it has been lit ?

I have a New World "plan 7" gas cooker model no: 21080 & the grill keeps popping & then goes out, a gas engineer says that it needs a new part as the mesh has got a hole in it, it lights perfectly but when you turn up the heat it goes out with a loud pop?????
Mrs Patricia Bettany, October 2011
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