Actually I can't think of any time that the Amiga hardware or OS1.x crashed.
Guru Meditation #84010007.00C13870
The problem with Amiga OS was that there was no memory protection, meaning that any program could screw around with other programs' memory, leading to a crash.
(unreleated but annoying: the occasional complete lock-up, after which only a CTRL-A-A could get you out of... At which point the OS would kill the various processes. If the problem process was killed the machine would start responding again, but at that point there was nothing you could do to prevent the reboot that would kick in two seconds later...)