>I have a problem where files recently downloaded go missing ... > I tried searching internet, nothing of answer came in view
Well, since we are at the fun section of @misc (explanation: there is a message where user claim keyboard types by itself, mouse is moving by itself, one user has missing ssh output, and maybe more like this) I can tell you about someone I know complaining that some friends disappeared from the Facebook list. After some time of grief and doubt, the culprit was found: $WIFE.