After an hour the system was restarted, syslog-ng seems to crash:
Sep 26 14:43:26 syslog-ng: syslog-ng starting up; version='3.25.1' Sep 26 14:43:26 kernel: pid 1737 (syslog-ng), jid 0, uid 0: exited on signal 6 (core dumped)
I have attached the core dump. Currenty i have no syslog anymore. The stats from the dashboard are not generated or viewed anymore, the "spinner" from webgui spinning without change...