Hi, I’m using CCR1009 8G 1S 1S+ router and PPPoE server with usermanager on it. Sometimes clients get automatically disconnected. I saw some red txt on log files. whats these? if its a problem causing disconnection, how can i fix them? please help me. Thanks.

Do you have a need for your router to be accessible from the entire internet?
If not, create a proper firewall for it so it does not accept incoming connections from internet.
On this router the default firewall is empty!