Internet is dying

Sat Oct 21 12:29:41 UTC 2017

Hello

My internet connection has become fickle. It happens that  there suddenly is no 
more internet connection at all. When I "ping" some site, then there is no 
output at all. KDE say that the IP of my machine can't be acquired. Then I 
can't contact my laptop, which is connected to the same router, either. Not 
even my dynamic DNS address (same machine) can be accessed. Then I have 
to reboot to get the connection back.

That used to be once or twice a day, but now it looks like it happens all the 
time.

There are some suspicious messages in /var/log/syslog and /var/log/kern.log.

In syslog:

Oct 21 13:20:26 desktop NetworkManager[1271]:  * Awakening mail retriever 
agent:
Oct 21 13:20:26 desktop NetworkManager[1271]: run-parts: /etc/resolvconf/
update-libc.d/fetchmail exited with return code 1
Oct 21 13:20:27 desktop NetworkManager[1271]: run-parts: /etc/resolvconf/
update.d/libc exited with return code 1
Oct 21 13:20:27 desktop NetworkManager[1271]: <warn>  [1508584827.4409] dns-
mgr: resolvconf failed with status 256
Oct 21 13:20:27 desktop NetworkManager[1271]: <warn>  [1508584827.4411] dns-
mgr: could not commit DNS changes: resolvconf failed with status 256
Oct 21 13:20:27 desktop NetworkManager[1271]: <info>  [1508584827.4412] device 
(enp2s0): Activation: successful, device activated.

In kern.log:

Oct 21 13:20:26 desktop NetworkManager[1271]: <info>  [1508584826.1508] 
manager: NetworkManager state is now CONNECTED_LOCAL
Oct 21 13:20:26 desktop NetworkManager[1271]: <info>  [1508584826.2337] 
manager: NetworkManager state is now CONNECTED_GLOBAL
Oct 21 13:20:26 desktop NetworkManager[1271]: <info>  [1508584826.2340] 
policy: set 'Kabelnetzwerkverbindung 1' (enp2s0) as default for IPv4 routing 
and DNS
Oct 21 13:20:26 desktop NetworkManager[1271]: <info>  [1508584826.2344] dns-
mgr: Writing DNS information to /sbin/resolvconf
Oct 21 13:20:27 desktop NetworkManager[1271]: <warn>  [1508584827.4409] dns-
mgr: resolvconf failed with status 256
Oct 21 13:20:27 desktop NetworkManager[1271]: <warn>  [1508584827.4411] dns-
mgr: could not commit DNS changes: resolvconf failed with status 256
Oct 21 13:20:27 desktop NetworkManager[1271]: <info>  [1508584827.4412] device 
(enp2s0): Activation: successful, device activated.

Please help!

Volker