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@Psy
Theoretically the whole point in the lockring is that you don't have to tighten the cup past the biting point, but you can tighten the lockring up as much as possible. Have you got a lockring?
Assuming you have a lockring though and it still won't stay tight...
New BB (a sealed one)? Or the threads can be re-cut at your LBS sometimes if the shell isn't too worn out.
New things would be good of course but a whole heap of loctite might do the trick. Although that will make you angry when you want to service the bearings again in the future.