Some also are reporting that their phones will get extremely hot when listening to music.
Spotify Community memberRandomIosDudebelieves the latest Spotify update is the problem.
“I am using two versions of Spotify on IOS 15.

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With the older version, there is no battery drain or overheating,” RandomIosDude states.
“So it’s a new bug with the newer Spotify app.
I ran Spotify, the older one, on IOS 15 last night for about three hours.

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I fell asleep by accident.
Woke up to maybe six percent of my battery drained if that.”
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Though another option is to just stop using the app if it acts up.
This obviously isn’t ideal if you use it often or want to listen to one of your playlists.
With Spotify on the case, the hope is that a fix will be made available soon.