Continous sparking of gas cooktop. continous sparking of gas cooktophi i've got a parkinson cowan

Question

continous sparking of gas cooktophi i've got a parkinson cowan strata gas oven. recently when i turn the oven on the top hobs start igniting. the cooker ignites automatically but we have to do the hobs manually. after five minutes or so it stops but as you can imagine it can be quite dangerous with all four trying to ignite. even when i am using them they are still trying to igninte. please can anyone help regards simon