Fanuc 0i-TD Controller on an L&L 950-6M Lathe.

This problem is completely random and has happens about 12 times a month or so. It occurs when the "Cycle Start" button is pressed. So when running in single block and when a program has been paused and is resumed. No errors or messages of any kind come up when this happens. The only thing that will spin the spindle above 10 rpm is to manually jog it. The only reset is to restart the machine.

Tried changing gears, opening another program and running in MDI.

Thanks in advance

I'm just starting out as a maintenance tech. (just about a year under my belt) and I don't have a lot of CNC control experience yet.