Yes, they did that very often when I played the convoy academy mission. I'm not sure what the cause is. Last year it was discussed again in some thread, and there was a pretty plausible reason for it, but I forgot exactly. I write it down to one somehow received damage by depth-charges or direct gunfire (aimed at you) of the other and changed allegiance. (which it does only temporarily for 24 hours) Either ignore them or make use of the confussion.
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