I am not 100% certain this is because of the Epistrophy sidequest line, or if there is a bug related to driving, but I am inclined to believe that this is a bug quest because it kept happening AFTER installing the new drivers and the 1.04 patch.
The game starts to crash faster and faster the more cars you help to track down, to the point where the game is crashing every minute, or less, the constant crashing kept happening after the 1.04 patch was installed and even after the game was uninstalled and reinstalled multiple times, the only way for me to fix it was to revert to an older save before I even looked at the human nature sidequest, after than the game ran smoothly.
I don't know if anyone else has had this issue with this particular quest (or with driving in general), so maybe I just have really bad luck.
The game starts to crash faster and faster the more cars you help to track down, to the point where the game is crashing every minute, or less, the constant crashing kept happening after the 1.04 patch was installed and even after the game was uninstalled and reinstalled multiple times, the only way for me to fix it was to revert to an older save before I even looked at the human nature sidequest, after than the game ran smoothly.
I don't know if anyone else has had this issue with this particular quest (or with driving in general), so maybe I just have really bad luck.