Can you confirm that it's only the taskbar that freezes? Do any other DE components (e.g. app launcher (shortcut meta + f2 by default)) work or do they freeze/not respond as well?
You could check various logs for errors:
syslog (/var/log/syslog or dmesg)
unit files of Plasma components (journalctl -xeu $UNITNAME; e.g. journalctl -xeu sddm.service)
Can you confirm that it's only the taskbar that freezes? Do any other DE components (e.g. app launcher (shortcut meta + f2 by default)) work or do they freeze/not respond as well?
You could check various logs for errors:
/var/log/syslogordmesg)journalctl -xeu $UNITNAME; e.g.journalctl -xeu sddm.service)