What brand of helicopter is this on? I had a HK450Pro that did this exact same thing and almost took my eye out. I didn't crash it, but I did remove all of the electronics and I destroyed the helicopter. The issue was weak parts, not the blades. This is when I purchased my Align heli. Best purchase I have made aside from my DX8.
When you order new blades, depending on what brand heli you have and size, GET ALIGN!. If this is a clone, I would replace every broken part with Align. If this is Align, then you found a very rare issue with one of their molded blades. I have never seen a blade fail. I have seen the plastic grips fail and if you have plastic grips, I would invest in metal ones. They are much stronger and will last much longer.
Let me know what heli you have.