Comment 8 for bug 2003339

I also have encountered this (quite a lot) in the last days (since I updated to 5.26.x). Sometimes I need to `kwin_x11 --replace` multiple times a day - sometimes I also then need to `pkill plasmashell && kstart5 plasmashell` as it becomes non-responsive.

Messages I've seen so far:
The X11 connection broke: I/O error (code 1) X connection to :0 broken (explicit kill or server shutdown)
The X11 connection broke: I/O error (code 1) XIO: fatal IO error 22 (Invalid argument) on X server ":0" after 171015 requests (171015 known processed) with 0 events remaining.
The X11 connection broke: I/O error (code 1) XIO: fatal IO error 2 (No such file or directory) on X server ":0" after 78026 requests (78026 known processed) with 0 events remaining.

There are more which I don't have anything saved for as they are from re-running kwin_x11 from a terminal.
There isn't anything interesting in dmesg or Xorg.0.log.

System information:
Operating System: Arch Linux
KDE Plasma Version: 5.26.2
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Kernel Version: 6.0.6-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Xeon® CPU E3-1245 v5 @ 3.50GHz
Memory: 31,1 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series
Manufacturer: Supermicro
Product Name: Super Server
System Version: 0123456789