I expreinced the same problem later in the war 1943, i was transfred to Brisbane from Pearl Habour and after doing some patrols around Rabul and refitting at Marshall Islands 2 times, i no longer had at mainbase.
My first thought was it might accur when using mods, and i havent tryed it without so i cant say for sure. Maybe its a game bug.
I still sail around getting new orders but i cant update my score anymore. il have to c what happens when the war ends
