PC reboots even when connected to UPS

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Forerunner
I have connected 2 monitors + PC 5700x rtx3060 + router to this APC 900VA Line Interactive UPS

UPS works fine when power is switched off and on from wall socket, the power transition to UPS and back to mains is smooth with no reboots and monitors don't switch off/on.

But I have noticed that when there is a blip in power supply, the PC reboots automatically (no need for manual boot) and monitors switch off/on. Though router doesn't reboot and internet doesn't get disconnected. What could be the problem ?
 
Your pc is most likely drawing more power than the UPS can deliver when the input is cut off (due to over/under voltage). Try running something on the pc while you turn the power off manually from the wall socket. You should be able to reproduce the problem.

If the same UPS worked fine earlier, it might indicate a weaker battery. Changing that might help, but it is difficult to be sure.

Router will work and most switching power supplies (including your pc SMPS) can tolerate higher input voltage range than the UPS itself.
 
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