Originally Posted by
FBinNY
OK, so it's not the hanger getting knocked around, so we're back to the original and basic question of are you tightening it properly. More specifically are you using two wrenches, one for the upper bearing, and one for the locknut? If not, then it's simply a case of night tight enough.
OP ignored the critical questions -- so typical of this forum.
I think we can deduce the answers.