IPhone heats up and drains really fast whenever I use Spotify?

I've been an iPhone 6 user for just over two months now, but I've been using Spotify on my iPhone for about a month and a half. For the past two days, Spotify has made my iPhone heat up really quickly, meaning that it causes the battery to brain really quickly too. It never used to do this until now. My phone doesn't heat up or drain really fast if I stop using it. One time it drained from 100 percent battery life to 8 percent battery life in about 10 minutes because of it. This even happens when I put my phone on sleep mode.

Why is it doing this? Is there any way to reverse it so it stops heating up and draining my battery life?

Added (1). I just realised I said 8 percent battery life, I meant 80-85 percent battery life.

Replace it

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