In California, they can't call it a "kill switch" - too many people would be offended!
imscots: yes, yours is one of a handful of bikes that have had this issue.
Are you, by chance, near the salt water, or do a lot of riding on the coast?
A little preventive maintenance will go a long way in those environments.
Electrical contact cleaner and some di-lectric grease on the contacts.
Cheers,
Steve