All this for the cost of postage from Hatteras to Quebec for a free replacement strap.
The level of Egocentrism displayed on this forum regularly by adult men (several of them) is hard to believe.
Temper tantrums that go on for eight or nine months in some cases.
If this is indeed the second (or third is it now ) buckle you have worn out.
And 7075 other customers have used the same assembly from this company (one of 11 companies who use the identical buckle) with some customers using it successfully for two thousand hours so far...
THEN YOU ARE DOING SOMETHING DIFFERENT, YOU ARE NOT THE NORM.
Here is a pic of a my Epic buckle, my Blade buckle, and a ten year old Naish buckle, all the exact same part (I looked closely at the mold marks) and all totally functional.
I used the Naish years ago, use the Blade with my small kites for three years, and use the Epic with medium sized kites for two years.
Epic is supplying a commonly used buckle, molded out of the same stuff and coming from the same suppliers as the other companies.
If your story is accurate, then you have statistically hit the lottery of unlucky...
or something strange is going on with what you are doing.