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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
Sumo
ShutUpBlud
I can't work out the physics of how you strip the lockring thread. If you try to skid and the cog starts to rotate backwards then it will start to tighten the lockring (anti-clockwise rotation of a reverse-thread), but it will just tighten onto the face of the cog. Two possibilities that I can think of are that you (i) are over-tightening the lockring and/or (ii) are using a weirdly skinny cog so that the lockring, when tightened, starts to strips the threads on the hub before it meets the face of the cog.