There could be a bad ignition switches, an igniters or a spark module. It is hard to say what exactly has to be done with your range because there is no technical information available on-line for any Viking products.
Oddly enough, they did start working again after a couple days.
I am not sure of the exact configuration, but I wouldn’t think it is the spark module because I believe that is shared by all the burners and some did work.
At this point I will just cross my fingers and hope they keep working.