Got that, too. I use FinAmp to listen to music on jellyfin on android
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Thanks, that solved my issue.
Leaving the post up for posterity
Nice : )
The official Jellyfin app isn't the best when run in the background, you're better off using a third party app for music like Gelli, Finamp, Symfonium, etc
A fix is to disable the Power Management (or whatever it may be called) for the Android app in your phone's settings. Depending on the manufacturer, this will have a a different name, and it is often quite aggressive. That said, there are some tailor-made music apps for Android, which are also a good choice.