That was a really smart idea to unplug your cooktop and let it dry out. Many times that fixes the problem, however, if the problem returns as in your case it is time to replace the wire harness. Their are 4x switches associated and directly under the 4x burner knobs. Moisture can case a short and send a false single to ignite the burner when nothing has been turned on. Take a look at this picture from the link. Number 12 is the wire harness that has failed.
http://www.searspartsdirect.com/partsdirect/partsdirect/showSubComp.pd?imageUrl=http://c.searspartsdirect.com/lis_png/PLDM/W0108041-00002.png
You can purchase this switch by typing in the model number on a appliance parts website and doing a search.
If you are handy here are some general steps to remove and replace the bad igniter/switch harness.
Fasten everything down and retest unit. This job should take around 45min to 1hr to complete.
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Always the best of luck!
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