I don't have blade breakage too often, but when I do it's usually because I have a bad habit of overusing my blade. I use it until it stops cutting like it should, then sometimes (depending on what I'm cutting) I'll tighten the blade and slow down a bit on my feed rate, maybe up the speed of the saw. I do this too often if, say, I've only got a couple more pieces to cut out to finish a project and don't wanna stop to change the blade. Usually it'll get ya by to finish up, but sometimes it won't.
Like I said, bad habit I know!!