Some waves are so high they'll expose your deck at 80 ft. You might have had this problem of the game being sensitive to that. Are you using any mods? I've discovered mods which lower the sub in the water to mask the wave exposing the keel makes the game do wierd stuff triggered by depth.
1) Sub doesn't get real world cruise or submerged endurance.
2) Errant voice calls having to do with shallow water or thermals.
Another consideration is the crew. Make sure you don't tire them out or they won't do anything.
-Pv-
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