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Which version are you printing? I'm really curious how this is happening, none of mine have done that at all. The V13 version (which I haven't uploaded yet, but am now printing with) should be better, I moved the brace arm further up, which should help, but I haven't had any tendency to flex at all.
What temperature and material are you using, and what infill percentage (and pattern) are you using? Which orientation did you use?