My laptop turns off itself

I bought my laptop(asus x52j)back in 2010 or 11(I don't remember)but in 2012 a problem occured with the battery so I always have it plugged in since then.I never experienced this problem before:while I was watching a youtube video,my laptop turned off.For a second I thought it was a blackout but my ps4 was still on.I turned the laptop on but it was operating slower than normal,so I restarted it.Everything was running fine for about 10 minutes after the restart but then it turned itself off again.What should I do?Please help me!!!!!!!
 
HWMonitor is a neat little freeware program that shows temperatures and fan speeds. You can use it to check for overheating issues. If the notebook has never been cleaned out or had the heat paste renewed there's a good chance it's down to that. If not, you could remove the notebook battery and run it on the mains/charger unit to see if it's the battery. (HWMonitor will also give info on the state of the battery you are using.)
 
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