pretty easy to do if they weren't mounted properly. If the holes weren't properly glued, or properly screwed down, it's pretty easy for moisture to seep into the core at that spot, thus weakening it right at the spot it sees a lot of stress. Just as likely could have been something totally different though. I snapped a pair of 4FRNTs carving down Main Street a few years ago, I guess just due to a shitty core. They snapped just behind the shovel, looked a lot like the surface new life or whatever with the weird angle rocker profile.