Hi all, I want some advice from people who may know more than I do.

In March of 2017, my friend and I built my PC. Ryzen 5 1600X, NZXT S340 case,Asus PRIME X370-PRO ATX AM4 Motherboard. We had difficulty mounting the motherboard correctly and in the end only 3 of the screws actually stayed in the standoffs. The standoffs were pre-installed in the case. Build worked fine for the last 3 years with minimal issues.

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Two days ago I wanted to do some cleaning and install a new SSD for total war games (improve the loading time). I disconnected it, cleaned out a ton of dust, installed the ssd, and didn't think much of it.

After that, it started randomly cutting out. By that I mean the connection to the monitor would go dead and would not come back on. It would go from working fine to going dead without any warning, and do this randomly between 15 sec and 30 min after booting up. It almost always booted up correctly after a forced power off when this happened. The video card remained lit and the case fans continued to run while the display was off. I thought my HDMI cord might be going, so I tried two others--same thing. Not the cord. I thought it might be overheating and shutting itself down, so I monitored temps with speccy and coretemp--CPU never got higher than 75 even under load, so I don't think it's that.

I took it apart and found that pretty much every single of the standoffs had stripped and only one screw was secure in the standoff (the bottom right one). was actually solid. So my motherboard has been improperly mounted these past years and something about my cleaning/moving it around did something to it where it's now (speculating here) contacting the case and shorting out?

I bought new standoffs and screws and am hoping to properly mount the motherboard this weekend. I would appreciate thoughts on whether the motherboard being improperly mounted may have indeed been the problem or whether something else may be at play. I'm happy to give any additional detail as I can