Okay so I've got a Prusa all built and it communicates just fine with Pronterface. However, it keeps crashing. When I tell it to move up and down in the z, it moves to where it needs to be and then the motors turn off until their next instruction. When I tell it to extrude or move in the x or y, the motors move but then stay on once they're still again. When I say they're "on" I just mean they're stationary but still making a mechanical whining noise as if they're moving. If two are more motors are in this state, the voltage from my power supply drops from 12v to about 6v and the gen6 electronics turn off. Consequently, Pronterface is no longer able to communicate with it. Is the problem with Pronterface, my power supply, or something else? Thanks in advance and let me know if there's any other helpful info I can post.