I can only think of 3 cases in as many years lol.

1. KDE patch at beginning of the week made it so scrolling the start menu crashed the desktop, fixed in ~3 days
2. LY changed the service to call it so I got booted into the TTY next time I started my PC
3. There was a wifi card update which stopped my wifi from working, fixed with a power cycle.

Don't know where arch got its reputation of being held together by hopes and prayers, maybe it was more unstable in the past?