It could be where you have your hand placed. I've broken 5 strings in the past 5 years. the first one was a g string that was about 2 years old. the second was tuning the new g. and the other 3 were an A D and G because of playing to close to the bridge. Places alot more tension on the strings. I've moved my playing hand closer to the neck and not only do i get a warmer sound but I havnt broken a strings in a couple of years now.