Well I've been able to play for several hours with the medium settings until a different kind of crash happened.
This time, the game froze while I was lauching a new match (50% of the time, it crashes when it found a new match) and I got an "ethernet cable not plugged in" error from ubisoft.
Game was unresponsive so I Alt+F4'd it.
Desktop background was gray and the taskbar disappeared.
Explorer not working. Ctrl+Alt+Del not working, Windows key not working either.
Alt+Tab was still working.
I had a zip file still opened in winrar so I tried to browse to the download folder which contains the opened file but it froze.
What's funny is my web browser was still playing a live on youtube and appears to be responsive. Everything else was just frozen.
I'm not sure if it was going to BSOD or not so I just restarted.
I just went to the event viewer and I still got no event records for around 15 minutes before it froze.
I have no record between 7:37:39 pm and 8:03:44 pm when I restarted.
The only error I got is at 8:30 pm : Unexpected shutdown at 7:34:42 pm.
I remember having a similar issue a few months ago on my main Windows install where every app were crashing one by one and I ended up having a lot of werfault.exe errors.
No records of anything in the event viewer...