Two Possibilities:
1st is a battery failure - check and see how old they are as this is the most likely cause
2nd a PSU overload - Either inrush current or Drawing more power for some reason
Two Possibilities:
1st is a battery failure - check and see how old they are as this is the most likely cause
2nd a PSU overload - Either inrush current or Drawing more power for some reason
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Two questions
Is the UPS powered from the wall when this happens?
Is the UPS connected to your computer via USB?