If your BB is still good, no play and silent, i would try to secure it once with Loctite.
If this doesn`t help, buy a new one!
Probably the thread on the lockrings is bad,
good luck
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Mark
Dancevalley 2th of august 2003 -> JXL, Laidback luke, Sasha, John Digweed, Monica Krusse.....and on!