Low volume part of songs get an artificial fade out - fade in which is really annoying. I've noticed it starting today, previously this issue wasn't there. I thought the normalization might cause it, but turning it off didn't help. It can be noticed for example Disturbed's version of The sound of Silence around 0:25-0:50 couple of times. For example when listening the same song on Youtube doesn't bring up this behaviour so it's definitely Spotify messing with the volume.