Restoring spindle error

HELLO HOW ARE YOU? I AM A BEGINNER, I HAVE A CHINESE MACHINE, NEJE BRAND, WHEN I SEND A LONG JOB IN THE MIDDLE OF THE ROAD, IT STOP, IT SHOW AN ALERT OF restoring spindle, but it never continues with the work, laser web is the only free program that I have gotten where I can ENGRAVE and cut at the same time, if someone can help me I would appreciate it very much. Thank you