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Do you tighten the lockring again after you've ridden it for a period? My guess is that the sprocket tightens after the lockring has been fitted.
Even a little slack between the two will eventually, over repeated skids, strip the lockring threads.
Have you been using the same sprocket and lockring? Have you tried fitting both, then trying to undo the sprocket to see if there is any slack between the two?
I don't remember reading of anyone else stripping so many threads, so it seems that there is something wrong with your set-up: it's not likely that you have had the bad luck to buy so many defective hubs.
The short answer (as mentioned earlier) is to use a converted disc hub: as the forum's favourite, curmudgeonly know-it-all is fond of saying "using threads to transmit torque, is something that makes engineers cry".
Scilly.Suffolk-
Hi.
Yes, as mentioned before, I do carry a chain whip, and tighten my lockring after I've been riding it. Usually on this first ride, I will use a front brake or foot jam- as not to put any backwards force on my cog. I then tighten it up regularly, because I've stripped so many, but it just seems to keep on happening
ShutUpBlud
Okay - I'll accept that I don't put cogs on properly, then. Still, when my cog is put on by an actual mechanic, I still manage it