Hi drronnie
I assume the saves you are referring to are your own manual saves and not the automated in game saves.
You could also try by reason of elimination removing a mod and testing.
Another thing to watch out for is where you are making saves.
Do not save within 60km of coast lines and any destroyed marks.
Check this out as it contains useful information for stable game play.
http://www.subsim.com/radioroom/show...21&postcount=2
Peter