by the look of it, it appears to me ripping the ball out on landing. This may either be a point where the wishbone needs a little beefing up, or the material not flowing correctly in the mould and cooling with a 'weak spot'. You expect a certain amount of breakages, but if they are coming from normal running, thats not a good thing.
Try some Tamiya front wishbones, might need a little adapting, but they may fit... if you are concerned.
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