So i bought this UPS 3 years ago i think, was working good and stable. Now idk why it just shutdowns when in my house electricity starts flashing or short circuit and it doesn't protects my PC and monitor.... On this UPS only PC and monitor + modem was connected, before it protected when electricity suddenly goes off. My UPS model: CyberPower 1500ie/900w, power supply's watt 850: connected gtx 970+4790. So whats going on? Why my UPS stopped protecting, seems like power is enough to both of PC and monitor + modem too. Already 2 times happened this situation... Im getting worrying;( I hope nothing bad affects to my PC and monitor