I was using my spotify just fine until today.  Suddenly my phone restarted while I was listening the music from spotify. I played the song again in spotify and few minutes later, my phone crashed again. I thought it was because of SD card first because I downloaded offline songs on sd card. But after I reformatted SD card, reinstall spotify, my phone still crashed. So I removed the SD card, reinstalled the spotify and phone crashed. Reformatted SD card and removed spotify from my phone and my phone didn't crash anymore. Help me here, why is this even happening? 

I'm using galaxy a5 2017 and uses marshmallow 6.0.1