The solution was found here for me (on Ubuntu 18.10 with Dell XPS13 and D6000 dock)
https://www.displaylink.org/forum/sh...t=65476&page=2
Quote:
#### Disable audio suspend
* `sudo gedit /etc/pulse/default.pa`. Comment out the line indicated below.
```
### Automatically suspend sinks/sources that become idle for too long
# load-module module-suspend-on-idle
```
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