error with telemetry and no page is served

Hello,
Caddy 1.0.3 was running for month without issues but today I could not reach my websites from out side. IP Address is ping able.
In Log of container I found this:

`
2020/03/22 19:06:26 [INFO] Serving https://pi905.broehlis.de

2020/03/22 19:06:26 [WARNING] Sending telemetry (attempt 1): Post https://telemetry.caddyserver.com/v1/update/88acc80c-e433-44d7-a260-c1069ebf2bb2: dial tcp: lookup telemetry.caddyserver.com on 192.168.100.1:53: no such host - backing off and retrying

2020/03/22 19:06:34 [WARNING] Sending telemetry (attempt 2): Post https://telemetry.caddyserver.com/v1/update/88acc80c-e433-44d7-a260-c1069ebf2bb2: dial tcp: lookup telemetry.caddyserver.com on 192.168.100.1:53: no such host - backing off and retrying

2020/03/22 19:07:01 [WARNING] Sending telemetry (attempt 3): Post https://telemetry.caddyserver.com/v1/update/88acc80c-e433-44d7-a260-c1069ebf2bb2: dial tcp: lookup telemetry.caddyserver.com on 192.168.100.1:53: no such host - backing off and retrying

2020/03/22 19:08:05 [ERROR] Sending telemetry: Post https://telemetry.caddyserver.com/v1/update/88acc80c-e433-44d7-a260-c1069ebf2bb2: dial tcp: lookup telemetry.caddyserver.com on 192.168.100.1:53: no such host`

Is this the issue for caddy not serving sites? How can I fix it?

Thanks