Playback stops in the middle of a play list seemingly at random

## Problem description

Seemingly at random the web player stops when there are remaining songs in the play list. If I restart play on the next song things will continue from there. Unfortunately, I haven't noticed possible other symptoms or correlated events.

### Steps to reproduce

Play an entire album. Ocassionally, the player will stop after finishing a song in the middle of the list.

## System information

* **Airsonic version**: 11.0.0-SNAPSHOT.20211208080314 – December 8, 2021 at 8:03:14 AM UTC [Commit: dc9c37c4611e17edfc6c1b830a7ccfbd567a2614]
* **Operating system**: Ubuntu 18.04
* **Java version**: openjdk 13.0.7 2021-04-20
* **Proxy server**: Apache from Ubuntu 18.04
* **Client**: Firefox
* **Language**: en_US