Response from Ameritron after several back and forth messages on the equipment, situation, etc.: "If it is that old, it does not have the +12VDC regulator issue. You might want to check and see what other appliances and devices you have plugged into that same breaker circuit. If you have something like a window mount air conditioner, it could draw enough current to cause your power supply to detect a brownout condition and it would shut down. Also, depending on where you have the power supply and how well ventilated it is, the power supply could be overheating and causing a shut down. Lastly, you could have a final that is about to go out, and every once in a while, the power supply sees too high of a current drain which would also cause it to shut down." It is my conclusion, because of my station's particulars, that the Power Supply is over heating. I'm going to take steps and see what happens.