Coming from a amateur stringer (100+ string jobs, not completely noob, but not like i'm a full time stringer either), majority of snapped strings were due to a mishit. When you hit the shuttle off centre, instead of hitting maybe at 4 intersection of strings, the shuttle only hits one string. This will cause the string to snap instantly, as the tension near the frame is higher (imagine a strip of rubber band, loose in the middle, and tight at the ends being held.).
The higher the tension, the more likely that it will snap from a mishit. I've done my own string jobs, and simply put, I've had strings that lasted so long that the tension dropped way below my liking. Other times, I've snapped my strings on the 3rd shot of a warm up.
I've used to use BG66UM for a good year or two, but the strings cost quite a bit, and added on top of how frequently they snap, I thought it wasn't the most economical plan. I switched over to BG-80P, which is a nice improvement over the original BG80. I've found a nice balance between hitting feel and how frequent I have to string my own rackets.
Some (uncalled for) friendly advice from a not completely noobish badminton player:
1. When a string snaps, look where the string has snapped. If it's near the frame. 9/10 you've mishit. If this happens, it's time to look into the consistency of your strokes and make sure you hit the sweet spot consistently.
2. After stringing a racket, make sure you let the string rest for a good 24 hours before you start playing. Generally, a day should be good enough for the tension to settle into the frame, but there's no real scientific evidence or explanation to why this is done. This is really hand me down information, that I can't verify, and I've seen players like Taufik hand a racket to be strung during a game, and start playing with it when it's done stringing. (yeah, 10 minute string job, blows my mind too.)
3. Tension itself should not be the problem since I would consider 24lbs still in a comfortable range, as I personally play around 28-32lbs (depending on the strings). Stay at the same tension, but change the thickness of the string, and find what you're comfortable with. Changing the tension you play at can affect your shot quite a bit, as you need to adjust your stroke speed accordingly.
Hope this helps in some way, shape or form
