What might have happened is i didn't work out all the kinks on the AI submarines. Dials frozen at 12 Oclock position are an indicator of this. The issue is when the game tries to load/render two objects (or nodes) that are used by the player at the same time. Siince AI subs were based on the player ones, its possible i forgot to remove or clone something so its not called on by the player and the AI at the same time.
S boat though.. that is odd.
edit: For what it's worth, I've only seen a couple of reports on this issue, it doesn't seem to be common or widespread. if it occurred more often, id have hashed it out and posted a fix already.
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