I'm in mid 1943 with my career now, in a Balao, and the worst incident incident I've had was a sudden and uncontrolable dive which ended in death - until last night, when I got my first encounter with the circular torpedos. Fired 4 fish at a fleet carrier, dead ahead, only to have ALL FOUR OF THEM get hijacked by the game's AI and rammed straight up my a$$.. Anyway, lucky I'd saved before attacking - reloaded my game and all went well.
Hmmmm... or maybe it's what those midget subs are for, hijacking our torps and using them agains us