Ubuntu 18.04.3 freezes

OS Ubuntu 18.04.3 LTS ; driver 390.129 installed with ppa here: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa.
After installing the driver I noticed that randomly ubuntu freezes completely: the key combination ALT+STAMP+ RSEIUB or RSEIUO it does not work !
Pressing the reset button it does not restart immediately but it takes a few seconds.
Before that, it didn’t happen with the Nouveau driver, but I can’t use it because CUDA only works with the Proprietary NVidia Driver and for 3d rendering using GPU i need to install it .
Can You help me?
(sorry for my bad english, i use google translate…)

Please run nvidia-bug-report.sh as root after a freeze and attach the resulting .gz file to your post. Hovering the mouse over an existing post of yours will reveal a paperclip icon.

Okay, thanks, but it will take time because the freezes don’t happen frequently.

hello, new freeze today, around 03.22 p.m. : as usual everything stuck, mouse, keyboard and I had to reset.
After restart i ran nvidia-bug-report.sh.
I attach the result
nvidia-bug-report.log.gz (166 KB)