Dave,
The first time was a manufacturing glitch - no biggie. The second one was after riding for about 2 weeks straight on the road in lots of rain, I neglected to lube the socket in the clutch handle and this caused the cable to fray and eventually snap. Both times this has happened I just sent the cables back to Barnett and they have repaired them free of charge. My advice, just make sure you keep the parts well lubed is all.