Apparently my laptop is cooled and is not overheating, I've performed a clean install of the game, no OC, I've defragmented my HDD and used ultimate defrag to put the folder in a high priority zone of the HDD, and I used to be able to play the game fine in older builds.
It seems worse when I'm in towns.
I noticed sometimes I would hear a zombie growl, but not see any zombie, and then the game would crash like if agroing that zombie would crash the game...
Some other times, opening a door could cause the crash, or turning the camera too fast in a particuliary dense urban area, but some other times it could happen without anything in particular happening on screen, in the middle of a field with 50+ fps...