I experienced this same problem when I first had my Cat. At first to get back out on track I just replaced the bolt, then the second one snapped and the third would not tighten the diff. The Circlip inside had worked out of its grove and can only assume that whilst doing this it was applying an uneven load under the head of the bolt and caused it to fatigue during opperation. So, take the diff appart and check the circlip is not just seated in the groove, but also tight in there (As has been advised in other posts on here).
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