I've been building computers for my friends and I for 25 years and the two worst "random stability" issues I had were high quality but aging PSUs.

The optimist in me hopes that the bullwhip effect will lead to cheap ram in a few years, and that the glut allows for the wider adoption and support of ECC memory.

Not just wholesale crashes, but all sorts of misbehavior. For example, cheap WiFi/BT/ethernet can wreak havoc on your connectivity and out of spec USB peripherals can cause all sorts of problems. Both can bring sleep/power saving problems.

Most people using computers aren't technical enough to be able to discern these things, however, and many buy the cheapest thing on the shelf and so these subpar components persist.

It has been 25 years, but back in college I had a job refurbishing and repairing PCs. Most problems were caused by cheap no name hardware. Most the quality hardware rarely had problems.

Maybe. But then again, as someone who dual boots, I see one of the OS crashing and giving an alround worse experience then the other, on the same exact hardware, while the other just chugs along.

Now, I'm not someone good at maths or physics, so maybe, somehow, it's actually more likely than not that the worse OS gets to run when there's worse solar activity going on or whatever else has en effect on my hardware, which also doesn't seem to affect memtest for some reason.

But the likelihood can't be that high. Can it?

Sometimes it's both. I had some crazy data corruption problems that turned out to be a one-two punch of a buggy anti-cheat driver from a game I was playing and a defective M.2 SSD slot on my motherboard. Without the combination of both factors everything was fine, but when I played the game with that slot populated, the disk in that slot started getting corrupted and failing to respond to requests from the OS (eventually hanging the system).

Wild troubleshooting adventure.