I'm not positive, but some Amigas don't seem to be affected by plugging/unplugging while turned on, like the A500, which seems even more indestructible than the military-spec A2000 (with its ticking time-bomb RTC battery inside). But I have first hand experience with the problem occurring on two of my A1200s, two CD32s and my A600. Each time it has been the same problem, and always after a plug was pulled out or pushed in while it was turned on.
I only wish I could afford to get these poor A1200s, CD32s and A600 fixed. I can't solder myself.