Change apps. I've been trolling the internet for a month looking for a solution to this in addition to volume spike issues and why my second to loudest volume setting is too quiet while max is loud enough to make my ears bleed.
Thread after thread discussing these issues closed due to "old age" with ZERO response from support other then requests to post system specs and nothing afterward.
I'm talking 5+ year old threads from this site with this issue and my only logical response is to assume they simply do not care. At all. I was about to root my phone to try and solve it as I love the interface and have a large playlist and assumed it would be an easy fix until a work friend made mention he had the same issues, same code of silence from Spotify and switched apps as I did tonight and......PROBLEMS GONE!!!!
I even have a better over all volume slider, no more second to max volume being way to quiet and max being way to loud which I assumed was my cell.
These guys don't care, seriously, 5+ year issues reported again and again and again with zero comment or resolution. Just switch apps.
Also having this issue on my Android head unit in my car, with Spotify installed directly on it (rather than streaming over bluetooth). Spotify is about half the volume of any other source (FM radio, internet radio, DAB, Poweramp etc). It's really frustrating, and leads to frequent moments where I jump out of my skin if the phone rings or if I change input source without remembering to first halve the volume!
All possible settings (EQ, normalisation settings etc) are switched off, so I should be just getting a straight signal out of Spotify.
Please fix this, otherwise Spotify is pretty much unusable for in car use.