As stated in the title.

I first booted my PC up today and it was frozen at the sign-in screen. So I had to force shutdown and restarted it.

Everything worked fine after but it immediately froze again after I plugged in a USB dongle for my wireless mouse. I force-restarted and it worked fine once again.

After few more tests, it seems that the PC would freeze/crash whenever I plug in any USB device through any of the USB ports whether on the motherboard or through the case front ports. A force shutdown and restart would then get me in no problem with all connected USB devices working normally without issue.

My PC was working fine for years until today. Board is MSI Z370 SLI PLUS. I have updated the BIOS, issue persisted.

Any idea what could be causing the problem here? PSU, MOBO, or software/drivers issue? How can I fix this?