This is not a problem generaly, it is nothing more than a keyless works problem, if the screw has come a littlew loose then the groove on the stem can pull past the retaining pin on the setting lever, you may be able to reset it buy removing the CG for more control unscrew the stem retianing screw another half turn but the crown to what should be the hand setting position, tighten the screw and it should reset the pin in the grove on the stem. It just takes a bit of feeling.
The problem here is caused by the srew loosening off every time you pull the crown, if you look at that retaining screw on the back as you open and close the crown you may some times see it turn back and forth but if it only turns when you push the crown in then it may be loosening its self.