Several times on my HAAS Mini Mill that is just about a year old, I've had the controller completely lock up on me, to the point where it will not respond to any button presses, and the only fix is to power off and back on the machine. It seems to happen when reading a file directly off a USB flash drive (FNC mode), and after a certain sequence of key presses that I cannot remember. I can remember changing modes several times quickly, from edit to memory, running graphics simulation, and resetting in the middle of running graphics.

The really odd part is I had it happen on a control trainer box too. Has anyone else had this happen? Something wrong with the flash drive?