Seems like a shot in the dark here, but could it be one of the changes in the various subs' "upc" files not noticed before?
I know you have to submerge the S-boats to hear anything, but the others are supposed to work as you said regardless of whether you're on the surface or not.
As Poirot would say, hope this helps the, "little gray cells" a little.
ElCid97
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