Legion.
It's both my favorite Polish game for the Amiga, and the game I consider most buggy.
And written in everybody's favorite - AMOS.
Sometimes you can play it for hours without a hang, and sometimes it "exits" itself at the copy protection check screen or at some city... it's all random!
After a while I kinda figured what triggers the hangs, like getting too many quests at the same time and not finishing a single one, etc., but I usually just loved to play the strategic elements (building a perfect city) then leveluping my team, and finally getting on with the quests. And I usually spent so much time fooling around the final boss killed me, but whatever, great game

PS: The PC remake is available here: http://www.legionpc.yoyo.pl/
Many bugs are fixed, you can change the game's language to English, and even turn that shitty blur effect off.