Same for me as well and I at least have not noticed any kind of pattern to it so far. It just happens at random when I try to save but what's more is that when I boot up the game again and try the load the save, I start getting an error saying:
"Warning the savegame has detected tampering or corruption. We Recommend that you do not continue with this savegame".
The save seems to load completely fine tho.
I found an extractor from Larian which can make this error go away but its still very annoying to have to do everytime I fire up the game.
Edit: I am playing the Def edition on the PC.
Last edited by Squal; 24/10/18 08:00 AM.
