Also the purple screen in your video in comment #2 does suggest a crash so please follow these steps:
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1908878 Title: gnome shell freezes for a couple of seconds, then it restarts (maybe it crashes?) Status in Mutter: Unknown Status in mutter package in Ubuntu: Incomplete Bug description: This is the line I always see in the log after the restart: Dec 21 09:33:55 ricsipontaz-home gsd-media-keys[5953]: Failed to grab accelerators: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.gnome.Shel l” on object at path /org/gnome/Shell ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: gnome-shell 3.38.2-1ubuntu1 ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14 Uname: Linux 5.8.0-25-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu55 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Dec 21 09:56:41 2020 DisplayManager: gdm3 InstallationDate: Installed on 2020-12-04 (17 days ago) InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201203) ProcEnviron: TERM=screen-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=hu_HU.UTF-8 SHELL=/usr/bin/zsh RelatedPackageVersions: mutter-common 3.38.2-1ubuntu1 SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1908878/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
