I'm getting this bug too. I've never gone to general quarters (mostly because I've spent my first mission trying to keep my crew alive), so it's nothing to do with battlestations. My deck was strafed by enemy planes, and it suffered damage. The damage seems to be irreparable. Worse, my periscope was destroyed entirely, and it's definitely irreparable. Anyway, since those calamities, whenever I station a crew member on the deck, he invariably gets sick. If I leave him in that slot too long, he dies.

I got so tired of it that eventually I just left all the deck slots empty, or manned them with corpses.

This is by far the most irritating bug I've encountered in SH4 so far.

I had it happen last night. It seemed that only one spot on the watch caused my crew to die ( the 3rd slot on the top row of the crew management screen : the rest were fine). I had a full damage control team and replaced the dead watch member with one of them. Needless to say I lost about 6 men before I figured out to just leave the dead watchmen where he was:nope: . And here I thought i was such a bad captn. that my crew just wanted to commit suicide:huh:

Theory: as to why watch crew's ill health!
 

They don't sleep enough off watch. Right after duty section change,rest of crew sleeps,but watch function does not. They can be induced to sleep.by swapping each one out with a sleeping crew member,in the just off watch section,sleeping.:hmm: