Partially and completely freezes on login and desktop screens

[Begalov]

What Happened

Partially freezes on login screen after lock.
Top panel works as expected, login panel can be focused after outside click, but I can't enter password and need to restart with shutdown menu.
Also two times desktop freezes completely, had to hard reset system.
Can suggest it's VGA issue it has problems with sleep since ms Vista - just turned it off.
Except this all works smooth and fine (but window caption context menu lack for every not systems apps - can make additional Bug report)

Steps to Reproduce

0. Sometimes
1. Login
2. Work a while
3. Lock
4. Tale a while
5. Freeze

Logs

How can i collect logs?

Platform Information

elementary OS 6 Odin fresh install on double parted SSD
Intel® Core™2 Duo CPU E8200 and RAM 4GiB
NVIDIA® GeForce® 8600® GT (GV-NX86T512H)