Thanks. Your system log is full of error messages about 'extensions'
that I have never seen before. Like:

févr. 20 11:55:15 hostname nautilus[2460]: Unexpected plugin response.  This 
probably indicates a bug in a Nautilus extension: handle=0x55d6331da690
févr. 20 11:55:15 hostname nautilus[2460]: Unexpected plugin response.  This 
probably indicates a bug in a Nautilus extension: handle=0x55d6334b7770
févr. 20 11:55:15 hostname nautilus[2460]: Unexpected plugin response.  This 
probably indicates a bug in a Nautilus extension: handle=0x55d63425e160

and

févr. 20 12:43:51 hostname gnome-shell[2029]: JS ERROR: ReferenceError: 
NM80211ApFlags is not defined
WirelessList<._getApSecurityType@/home/username/.local/share/gnome-shell/extensions/extend-panel-menu@julio641742/indicators/network.js:448:1
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22                      
                      
WirelessList<._accessPointAdded@/home/username/.local/share/gnome-shell/extensions/extend-panel-menu@julio641742/indicators/network.js:567:27
                                     

Please try disabling/uninstalling all gnome-shell extensions other than
the Ubuntu default ones (gnome-shell-extension-appindicator, gnome-
shell-extension-ubuntu-dock), and tell us if the bug persists. If that
fixes it then please try to figure out which extension was causing the
bug, by reintroducing them one-by-one.

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https://bugs.launchpad.net/bugs/1750352

Title:
  gnome-shell freeze on key press  while high CPU load

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