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@Joseph
I'm running 44 - 15 at the moment but I don't know how relevant that is to my issue though?
I did check the threads for shavings or broken threads, was fine though, made sure I screwed the cog on 100% properly too along the right threads.
I did some uphill (ish) riding with the lockring on loose and the cog on hand tight then tightened up the lockring after, was nice and tight. But then I just did the rotafix method (to tighten) and managed to get about another quarter turn out of the cog, and then re-tightened the lockring. So I guess it's now as secure as it's even going to be and I never get this problem again! I'd highly recommend the rotafix method!