I have a UPS and a server connected to it. It works well all day long, but something after midnight its leds start flashing and it does doing some noises, like "tec, tec" as a relay. And it continues increasing the speed between this until it completly turns off. It just can't support the server. After this I need to wait a few hours to make it work again, or it will turn off again.
What means this?
thank you.