I was able to reproduce this finally. It is a matter of killing media-
hub-server:

pkill -9 media-hub

(this has the same effect as a media-hub-server crash).

media-hub-server re-starts, but it looks like not all the system
recovers and re-connects to dbus-interface. Voice calls ringing,
telegram notifications and videos/music still sound, but SMS
notifications and screenshots do not emit sound anymore.

So we have here:

* A media-hub-server crash (could somebody please check if they have
crash files for media-hub-server in /var/crash?)

* An issue with reconnections to media-hub, for:
1. SMS notifications. telephony-service-indicator is the responsible for them
2. Screenshot sound. unity8 is the one emitting it

Recently there was an effort to make media-hub *client library*
resilient to media-hub-server crashes, but it looks like that has not
been enough for this case. However, I am not sure if we can completely
restore transparently from the library or we need that indicator/unity8
to be ready for media-hub crashes and be able to re-connect.

** Changed in: media-hub (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1544477

Title:
  No sound notification for new SMS (Ubuntu Touch)

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