PC was stuck in a boot loop all day yesterday, today it works fine. What happened?

So yesterday I woke up to my PC turning off and on rapidly, probably 20-30ish times per minute. I disconnected the power and let it reset and when I plugged It in the same thing occurred.

I went into a bunch of stuff shy of replacing parts, (reseated RAM, CMOS battery reset, disconnected all peripherals, etc.) after about 2 hours of troubleshooting I had given up hope, and just said fuck it, probably the power supply and I’ll fix it when I get paid.

Well this morning I thought I should try it again to see if anything changed. Works perfectly fine like nothing was wrong. Kinda confused by the whole situation. Anyone know why this would happen temporarily like this?