Hi, Could be anything but chances are it's the battery. It's very rare (but still happens) for the electronics of a UPS to be faulty. Try leaving the UPS powered on but without any load (PC, monitor, printer off) for a few hours or better still overnight. Try it again and observe if the random shut off occur. If yes, then it is time for a replacement battery. At certain instances, it may be that the UPS is working too much (overloaded), try just running the CPU to the UPS and the monitor directly connected to the mains. Hope this be of help/idea. post back how things are or should you need further information. Good luck and kind regards.
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