[2021] [Crash/Freeze]Game crash to desktop after 2-5 min of gameplay

After 2-5 minutes of playing, game crash to desktop without displaying any errors. The problem persists for about a week (after TU 12.1 update). Before TU 12.1 update, game run without any problems.
I tried the following:
- Reinstall Windows (latest updates)
- update video drivers to latest driver
- try to run game on old stable driver
- reinstall Ubisoft Connect
- run game without any software in background (discord, msi afterburner, riva tune...)
- reinstall-verify game files
Before patch TU 12.1 game run fine with Discord and Riva tune in background, no crashes at all.
My specs:
I7 4790k
GTX 980 TI
32 GB RAM
OS installed on SSD M.2
Game installed on SATA 3 SSD (try on HDD too, no effect, game still crash to desktop)
The game still crashes after today's maintenance.
Ubisoft, what do we have to do to be able to play the game we bought ???