My jack servery suddenly from nowhere started to trow xruns and I lost real time priority permission.
thats becuse realtime-privileges package have no effect when Im in the realtime group.
I have to use /etc/security/limits.conf file to get priority. an update removed it. I think there is a problem here. this file /etc/security/limits.d/99-realtime-privileges.conf dos not seem to have an effect.