I had crashes about 2-5 minutes. Now 0 crashes after hours of playing.
Solution : turn off shader/disk cache in Nvidia driver panel.
To make sure I turned this on and I had crash after 3 minutes of playing.
And, If you use alt+tab during playing you must be sure that crash is coming within 2-3 minutes - even with this solution. So don't go to desktop during playing.
Please Ubisoft make workaround for this is in next patch
Good Luck !
Unfortunately this Fix did not work for me. The Game still freezes randomly and crashes to the Desktop.