gears jamming
Was the engine ever apart before you fixed it the first time? For it to happen twice, it's obviously not being fixed correctly.
Look closely at circlips /washers on the primary/ secondary trans shafts. Also the shift drum,forks. If it was taken apart before you got it, I would try to figure if a incorrect part was installed- shift detent/drum/forks/etc.
I'm sure you already checked, but as you said- it shouldn't have broke in the first place, let alone a second time.
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2012 xc300 - Great bike! sold  looking for 18+
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