At random times Plasma session restarts

[Kobold]

Did you check this 2 issues under Known Issues?

@philm

KDE Plasma hangs on Shutdown, Restart and Logout

With KDE Plasma 6.1, the session saving feature can make Plasma hang.
A workaround is to disable it in System settings > Session > Desktop Session, by choosing “Start with an empty session”.

• KDE Hangs on Shutdown, Restart and Logout. Black screen [SOLVED] / Applications & Desktop Environments / Arch Linux Forums

@philm

System freeze on suspend

A feature in systemd 256 freezing a user session when suspending may freeze the system.

• [SOLVED] System freezes after sleep since update / Newbie Corner / Arch Linux Forums
• Systemd 256 may break sleep

The issue is most prominent with Nvidia systems but reports exist that it may affect other systems as well.

System freezes for 60 seconds and then wakes back up or hangs after waking up

Since systemd v256, systemd freezes user.slice before sleeping. This process can fail due to kernel bugs, particularly when KVM is in use.[13] [14]

Messages in the logs will contain Failed to freeze unit 'user.slice' before sleep. When such an issue occurs, trying to login (start another session) would fail with pam_systemd(process:session): Failed to create session: Job 9876 for unit 'session-6.scope' failed with 'frozen'.

To temporarily revert back to the old behavior, edit systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, and systemd-suspend-then-hibernate.service with the following drop-in:

[Service]

Environment=“SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=false”

– [Power management/Suspend and hibernate - ArchWiki ](https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate#System_freezes_for_60_seconds_and_then_wakes_back_up_or_hangs_after_waking_up)

You can also complettly skip SDDM when you want to restart/shutdown… this evades problems too.

System Settings>session>log out screen: shown, mark it unselected.

Additional i can recommend to remove splash screen also:
System Settings>Colors & Themes>Splash Screen>None

Most Important for you, right now since you face this issues:
System Settings>Screen Locking:

Lock Screen Automatically: Never (You may just want to adjust this Value, if the Lock Screen is important to you, but disable the Lock after sleep should solve the most pain, that you face right now)
Lock after waking from sleep: unchecked.

Less features, less bugs = more stability.

That said, if the first 2 work around’s cure your problems, you may don’t need to disable this SDDM Features.