I haven't seen a issue, and mine does not loosen. Even if it did loosen, it takes several complete turns of the threads to disconnect, and if it fell off "moments" after securing it, its hard to imagine it turning that many times.
I do check mine visually as well as making sure its tight, since a cross thread can tighten a screw with only a partial turn, and it will easily separate.
The weakness in the system comes when users must repeatedly screw the attach point into their camera or lens base, and it just takes one cross thread when you feel it tighten to cause the issue.
It would be nice if everything were foolproof, but, as they say, fools are just too ingenious. (Not talking about the OP).