Steps to reproduce:

1. In message settings set timeout to 60s, play once and have a track that is minutes long.
2. Send a disaster problem and observe the message box and sound playing.
3. A bit later send a high severity problem and observe it appearing in message box and disaster sound still playing.

Now observe that disaster message has timed out and it has disappeared from the list and sound has stopped. Yet high severity problem sound is still active, but no sound is playing.

It probably is waiting for the next refresh, but high severity problem times out before it, so we never hear that sound. Similar situation when message timeout is set to about five minutes - disaster sound ends, message disappears, but high severity sound starts playing only after next refresh. Perhaps the new sound (with lower severity) should start playing upon closing the previous message (with higher severity). And also maybe we know exactly at what position to start playing it? Maybe not from the start if track is longer?