Screen goes blank after using beta for a while

Using beta it has happened a few times already that after using the desktop app for a while and doing a big number of moves and completes, the screen suddenly goes blank.
This last time it happened exactly after I did a move from one pane to another, the screen went blank and became completely unresponsive.
I am not sure if it is the time it has been open and running because in other occasions I just left the window open and went to other apps in other desktops to work in something else and when I came back the screen was blank and the application frozen.