Description:
Something messed out with my
[denixx@denixxwork ~]$ lspci
...
01:00.0 VGA compatible controller: NVIDIA Corporation GK208 [GeForce GT 730] (rev a1)
...
Freezes happen when something is done. Ctrl+Alt+L, popup message, messing with chrome-unstable windows, etc...

Additional info:

* package version(s)
[denixx@denixxwork ~]$ pacman -Qe | grep nvidia
nvidia 387.22-5
nvidia-settings 387.22-1

[denixx@denixxwork ~]$ pacman -Qe | grep xorg
xorg-luit 1.1.1-2
xorg-server 1.19.5-1
xorg-server-utils 7.6-4
xorg-server-xvfb 1.19.5-1
xorg-smproxy 1.0.6-1
xorg-twm 1.0.9-1
xorg-x11perf 1.6.0-1
xorg-xauth 1.0.10-1
xorg-xcursorgen 1.0.6-1
xorg-xdpyinfo 1.3.2-1
xorg-xdriinfo 1.0.5-2
xorg-xev 1.2.2-1
xorg-xinit 1.3.4-4
xorg-xkbevd 1.1.4-1
xorg-xkbutils 1.0.4-2
xorg-xkill 1.0.4-1
xorg-xlsatoms 1.1.2-1
xorg-xlsclients 1.1.3-1
xorg-xpr 1.0.4-2
xorg-xprop 1.2.2-1
xorg-xvinfo 1.1.3-1
xorg-xwd 1.0.6-1
xorg-xwininfo 1.1.3-1
xorg-xwud 1.0.4-2

[denixx@denixxwork ~]$ pacman -Q | grep mesa
lib32-mesa 17.2.5-1
mesa 17.2.5-1
mesa-demos 8.3.0-4

[denixx@denixxwork ~]$ pacman -Q | grep libgl
lib32-libglvnd 1.0.0-1
libglade 2.6.4-5
libglvnd 1.0.0-1

* config and/or log files etc.
see attachments. output of dmesg without UFW spam. And small part of journalctl.

* found also the same problem here: https://devtalk.nvidia.com/default/topic/1026035/-gtx-970-w-kde-kwin-nvrm-xid-pci-0000-2a-00-31-ch-00000028-engmask-00000101-intr-10000000/?offset=4

Steps to reproduce:
Can't find a way to reproduce it with 100% probability.

Also, will try to update nvidia package to 387.34-5.