Is my hard drive failing? PC shuts down while playing GTA V

Jul 21, 2018
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2 weeks ago my PC started freezing once every day. After i rebooted, it was completely fine.
Somehow, this problem has magically fixed itself.
Sadly, now when I play GTA V, my PC randomly shuts down, similarly to a power outage. Sometimes it's fine for hours, sometimes it only takes a few minutes (it never crashes while loading).
Im suspecting a hard drive issue, because HD Sentinels Short Self-test results in: Test Failed by Read Element, even though it only shows 1 weak and 1 bad sector on the HDD (which have been there for more tha 9 months now).
I don't have any other problems, but my PC boots very slowly after one of these crashes.
So is my HDD dying?
 
Jul 21, 2018
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So I've tested on some other games with high system requierements, and they also caused the PC to crash. I guess that confirms the PSU issue.
Now I'm just wandering if the freezing after boot issue, which fixed itself, was related to something else.