If it was only one I would not be whining about it here. <g> I think it was Auric Goldfinger who said: Once is happenstance. Twice is coincidence. Three times, it's enemy action.
3 broken ones... I'd be calling Audix about this. Where all 3 clips purchased at the same time? Maybe a bad batch.
I have 2 old (almost full circle style) that have lasted, and 5 or so of the Open style /low profile screw with many shows.