5th time I’ve bent the ball retainer. Why?

I’ve had the 4-wheeler for 12 years, and in the past 3 I’ve bent the retainer 5 times. 9 years everything was OK, and I’ve made no adjustments. The unit is basically bone-stock, no mods at all. Basic farm use, no off-road activities. I’ve enclosed a pic. I appreciate any and all help. Thanks in advance!

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