u/Embarrassed-Rip-9432

i bought this 1500VA ups like a few months ago Which is still pretty recent, it has been working perfectly fine powering my monitor and pc until 2 days ago where it starts beeping (even when there's electricity) for no reason and shutting itself down even when it's connected to electricity, and it doesn't even show a red dot it just shows a green dot like it's fine but it's beeping then boom shut down and i this happens randomly, i could be using the pc and it happens at any time and i made sure that there's no overload on the ups, what could be the problem