If your AMAYA, BRAVO, or EMT16 machine is running normally, but occasionally shuts off unexpectedly, it is likely an issue with power fluctuations.
It is very important to protect your Melco machine with a line conditioner.
Make sure your power outlet (wall outlet) is properly grounded. This can be tested with a volt meter, or a simple device designed to test grounding.
If there are error messages before or after the shutdown, contact a Melco Technician and review the specific errors. If a motor is failing it can cause the machine to shut down. You may get errors indicating a motor problems such as X-Axis, Y-Motor, etc.