axle pin problem

[maxxbear]

don't know if you guys can help,got a flm/mmm maxx with 1/8 scale diffs,running on 5s,and i keep breaking the right rear axle pin,i've replaced that pin about a dozen times can't figure it out.unless i've got issues with the diff may need to take it apart.haven't had any probs with the other 3 corners.am using mip cvds on this for 6 years,wouldn't think that would be the problem.anyone have any ideas.thanks oh my the way have used 17mm. traxxas,ofna's and currently use integyswhich have been the best hub so far.