Problem with the playback!?

[flashlight2]

I use Spotify Premium on my Sony Xperia E. Everytime when I play a song, the song starts and one second later, the song is loud and directly afterwards, its normal again and continues flawless. I don't know whether it's up to the bad performance of my cell phone or whether it's up to the adjustment. The normal music-player and YT work without any problems.