LuKy

I already contacted my internet provider. But like always it needs time 😪

Sounds like you're using PPPoE potentially and the ISP side ended the connection attempt. You'd have to contact them really. I would suggest checking direct to your modem first to see if the same happens.

Thanks, than I will try it first. 

I replied to your other topic about this: https://forum.netduma.com/topic/57956-dsl-anschluss-mit-dem-netduma-r3/#comment-435154
 

A reboot scheduler helps solve the issue of the router becoming sluggish over time by rebooting it, which clears the memory and cache.
For example

Fair enough, thanks for the explanation!

It's done !😉