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ShutUpBlud
M_V
If you don't tighten the sprocket on enough, then no matter how tight you do the lockring eventually the sprocket will unscrew slightly and it's that bit of room that causes the threads to strip. When you lock up and it turns slightly before grabbing, that's what takes the thread off. I've done it a couple of times.
@ShutUpBlud a good quality lockring like a Dura Ace will help stop it happening in future, but as others have said the only real solution is to use a bolt on sprocket instead.
http://www.velosolo.co.uk/shopdisc.html