A am asking about problem with USB data stick (that uses fat32 file system).
If you unplug USB stick without unmounting (safly remove) data may become locked when you mount USB stick another time (you can't make changes to files). If you unmount and mount partition few times, data becomes normally accessible.
Problem is that I can not repeat (force) this problem now. But it has happened many times even recently. Has this been happening to someone else?