I use Ubuntu 20.04 and I have the same problem.
A similar bug I reported here:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1895486
After some use, I noticed a delay when using keyboard media controls
(for example: increase volume audio).
The first time I push these key Gnome hangs for a short time before
display the action on the screen.
(This problem is still happening in Ubuntu 18.04 too. Even worse some
times, the system crashes when using media keys.)
For some reason, my Gnome freezes when using Fn keys, or when I try to
use two keyboards. A friend of mine pointed to me that it occurs when
switching to a keyboard layout that has Scroll Lock enabled, so I
disabled it in the X11 keyboard layout file for my language, and it
solved the problem.
A workaround to solve the problem is:
1) Opened the keyboard layout file for my language, in my case:
sudo nano /usr/share/X11/xkb/symbols/br
2) Commented the line:
modifier_map Mod3 { Scroll_Lock };
3) Logged out and logged in again or run command setxkbmap.
These steps are specific for the Brazilian Portuguese ABNT2 Layout and
may not work for other layouts, but it can help you find a similar
solution.
** Package changed: meta-gnome3 (Ubuntu) => gnome-shell (Ubuntu)
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https://bugs.launchpad.net/bugs/1777708
Title:
Desktop briefly becomes unresponsive when typing on 2 keyboards at the
same time
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