They are a weak point, that's for sure.
One solution is to use shafts from a B4 and use limiters or something inside. Not sure how this works as a B4 shaft is smaller, but people say it works.
I used to go through loads, but have had some reasonable crashes lately and not broken one for nearly a year now.
Personally I think there were dozens of bad batches and you've struck unlucky...
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