Problem with APC UPS Model BF500BB

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Problem with APC BF500BB UPS
Data sheet available at: /$FILE/990-2106B_REV03.pdf

Every time there is a power failure, even if it is very short (less than
a second), the BF500BB starts an alarm (from its embedded piezo) which
emits a continuous tone until I press the power button to turn off the
device. This problem occurs whether the UPS is connected to the computer
by its USB port or not.

Of course, there is the noise which is annoying, but primarily there is
the fact that I must shutdown my computer to reset the UPS, even when
the power failed for only a fraction of a second.

Does anyone have a fix for that?

Thanking you in advance,

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