Thank you, chaps!
Like witpqs, the only thing I gave under computer control is one, maybe two, CS convoys. But if leaving that door ajar is what starts the program misbehavin', I'd better consider dispensing with them.
Feinder, you may well have a point about the origins of this TF, as I think I created it from ships already in another TF at Balikpapan, then disbanded most other ships in that source TF into the port. But one thing I'm sure of is that neither the original TF that provided the ships for this Wandering Willie nor any other ever had its destination set for 71,44 - it's just not a place to which I've ever wanted to go.
<sigh> Just another of those things to live with, I suppose. No big deal now, but

when the US starts fitting firing pins made of decent Japanese alloys to their contact exploders [:D]