Slam tilt?
There are at least two tilt switches which will cause the machine to make a Woo-woo-Woo-woo sound and reboot the machine. One switch is on the coin door, and another switch is near the plumb bob and ball roll tilts (left side of the cabinet). Might be more of them, sometimes playfields also have slam switches (check a schematic or look at the game). The cabinet slam tilt switch has a weight on one of the blades, so it tends to bob around when the machine gets rockin.