Yeah this sounds like a simple part failure with the bulb manufacturer and not an indication of Kawasaki's long term performance and reliability.
Those bulbs are so easy to cause reduced life with. A simple partial fingerprint can shorten the bulbs life by two thirds, and a smudge of grease/oil can make it blow out in only a few minutes.
It's $6.00 for a replacement if you wanted to do it yourself, but like you say.. it's under warranty, let the dealer fix it.
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May the road always curve in front of you.