If there's air filters on the unit clean them....test
If no help take the side panel off...test
I just bought my computer last year and I used it for work. Yesterday, while I was doing my work it suddenly turned off and when I turned it on again after 20 minutes, it restarted on its own. So I knew this is not as normal as before. I hope someone could help me fix this problem. I need to finish my work as soon as possible!!!