Hello John, my name is George,
It is normal for all four burners to spark simultaneously on this hob; just not on their own.
Can you tell me; has anyone been cleaning the hob or has anyone spilt water on the hob recently?
Ok, that is most likely your cause and it should be easily rectified. You will have water in the switch string.
I must go out on call now, but will be back shortly to respond to your responses and to continue with your problem.