Yeah, I've seen this happen before. I agree with all who say it's the build. My friend's rear wheel broke a few spokes, and she had the hack LBS replace them...and then even more broke than the first time, etc., etc. When she showed me the wheel, lots (10 or so) of spokes were broken. I took the wheel and rebuilt it (reusing rim and hub) with new DT 14/15/14 spokes. She paid me back the $40 for the two boxes of spokes and in brownie points for the labor. She's ridden the rebuilt wheel for over a year now with no complaints.
Build is super important.