A coupe of times now, when moving a file from an external USB D to my internal HD, the system has locked up. The start menu disappears that I can't execute any keyboard maneuvers (Ctrl Alt PrtScr REISUB) to get back up and running. I needed to hit the reset button.
Not sure if it's LXDE or my old hardware. I went back to using KDE to see if it happens in in that DE.