B129 preview 21 (B129 also was pushed to the stable live build of the game yesterday) has the following patch note.
"Fix: Merchant ships are now much less likely to travel in groups, when they don't have any escort."
I haven't played in a while but from what I have read, the unescorted mini-convoy's were either removed completely or are extremely rare.
Personally I felt they should have stayed at their old frequency, but they become more and more rare as the war goes on.
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