Hallo HansHiasl,
wozu benötigst Du die Gruppenzugehörigkeit "audio" bzw. "power"? Falls die nur "auf Verdacht" bestehen, mal entfernen und prüfen, ob's einen Unterschied macht. Siehe:
There are some notable exceptions which require adding a user to some of these groups: for example if you want to allow users to access the device even when they are not logged in. However, note that adding users to the groups can even cause some functionality to break (for example, the audio group will break fast user switching and allows applications to block software mixing).
Users_and_groups#Pre-systemd_groups
Gruß, k.osmo