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1.refix the battery
2.fully charge your battery till 100% without any interption 3.now you work with your laptop untll it would be the 0%. 4.Kindly repeat the steps four times. 5.After that you Defently feel,your battery backup will increase.
it could be caused by a lot of things. isolate it first. since its randomly shutting down, try first in normal mode. does it heats up before it turns off, if yes its an overheating issue. you may need to replace fan or even motherboard of your pc. have you checked your battery? is it properly seated? or is the problem happening when your system is plugged with the ac adapter? try to check the power cable.
Try going into device manager click start then control panel then system they hardware then device manager if there is a yellow !mark next to sound then use the properties tab to reinstall the the driver Hope this helps