Neon desktop (plasma 6.7.4): Suddenly freezes

Sudden freezes with mouse and keyboard, so no change to do anything than reboot.

Last part of output of journalctl -b -1 -e - in new session of course (has nothing to do with synaptic, just a sudden event):

aug 24 12:06:41 KDE-neon pkexec[2417]: hans: Executing command [USER=root] [TTY=unknown] [CWD=/home/hans] [COMMAND=/usr/sbin/synaptic]
aug 24 12:06:42 KDE-neon dbus-daemon[962]: [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)
aug 24 12:06:42 KDE-neon kded6[1857]: PendingCall Error: "Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)"
aug 24 12:06:42 KDE-neon kdeconnectd[1749]: Cannot find a compatible running Bluez. Please check the Bluez installation. QtBluetooth requires at least BlueZ version 5.
aug 24 12:06:45 KDE-neon packagekitd[2228]: Starting pkgProblemResolver with broken count: 0
aug 24 12:06:45 KDE-neon packagekitd[2228]: Starting 2 pkgProblemResolver with broken count: 0
aug 24 12:06:45 KDE-neon packagekitd[2228]: Done
aug 24 12:06:45 KDE-neon packagekitd[2228]: Entering ResolveByKeep
aug 24 12:06:45 KDE-neon PackageKit[2228]: get-updates transaction /269_dbbdeade from uid 1000 finished with success after 1477ms
aug 24 12:06:46 KDE-neon systemd[1]: systemd-localed.service: Deactivated successfully.

In the mean time I learned that it has to do with my Logitech USB Unifying Receiver with MX Anywhere 3 mouse and MX Keys keyboard.

sudo apt install bluez bluedevil showed that both where installed and at the latest version

sudo apt install QtBluethooth (checked qtbluetooth as well):

E: Unable to locate package qtbluetooth (and QtBluetooth as well)

Any reaction appreciated!

Kind regards,

Hans Troost

Freeze happens, but I can’t relate this to bluetooth. It happened after long copying about 100 GB data from one external usb connected sdd to another. During the freeze the keyboard functioned (was able to switch to the vt) and it lasted about some minutes, then the normal operation resumed. Now the freeze happens after every restart and lasts about a minute.

Any ideas what to check? Something in kf update?

Edit: seems to be the same as here: Clicking the desktop causes an invisible surface to capture pointer input