Suffocating ???

[JAKE]

I just recived my copy of this add-on and when I surface my oxygen supply dosen't get replenised i tried submerging and surfacing but nothing happens and I can be running on the surface and the it goes to a screen saying Submarine destoyed. Just wondering if anyone else has had the same problem? I saved the game just before I run out of oxygen and reloded the game and then the problem goes away but its still annoying having to save then reload the game everytime I submerge