Ahhhh.................. that's either due to LOTS of heavy bends and/or a slightly rough fret. FWIW, I've been practicing high-E bends recently and broke two 9 gauge stings in 2 days. Reluctantly switched to a new set of 10's. Edit: How low is the action on the high-E? The reason I ask is that if the action is VERY low you may be applying a lot of downward pressure on the string which can exacerbate string breaks. Higher action is much easier on strings when it comes to big bends.