unfamiliar smell from the desktop PC

The desktop PC was built by myself few years ago when it was my first time ever I bought the hardware and built it by by myself. Before that, I either used laptop computer or brand PC and I never built a PC by myself.

In fact, from time to time, not very often though, my computer could experience sudden blue screen and has to reboot the whole system or sometimes too lagged. It's said that it might be due to the fault PSU. However, usually after reboot the whole thing is fine and only after another few months my computer would suffer a bluescreen again, not very often.

I don't know why it is. When I was using laptop or brand PC I never had bluescreen.

In addition to that, from time to time, I could smell some unfamiliar metal smell coming from the PC but the smell would disappear soon.

And now the computer still working apparently correctly.

Is my hardware already having "partial“ failure

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unfamiliar smell from the desktop PC