Garmin Won't Honor Its Warranty! Olathe Kansas

I bought a Garmin Nuvi GPS unit.  From day one, it powers off and back on sometimes when I touch the screen, which is annoying and dangerous in high traffic times.  I contacted Garmin while still under warranty.  They replaced it with another unit with exactly the same problem.  Garmin gave me some troubleshooting steps.  When they didn't work, they refused to do anything more, saying it's out of warranty.  They never fixed it while it was under warranty!  They actually had the nerve to offer a discount off the purchase of a new one.  They want me to give them MORE money after the first one didn't work!