Same here, after latest gjs/polkit bionic updates about once per day this issue happens. Syslog contains some .js blames about polkit (attached).
** Attachment added: "syslog-err.log" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1812373/+attachment/5231470/+files/syslog-err.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1812373 Title: Desktop is not restored correctly after screen saver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1812373/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs