How to prevent automatic playback switching from laptop Spotify player to my iPhone and back

[biercoff]

Usually, when i'm in the office i have spotify playing on my laptop, but when i leave my working place and walk out i turn music on my iPhone and play music there. The proble is that i listen different music on laptop and iphone. Laptop - it's more like background and calm music, iPhone is mostly songs from my favorite playlist. Now , when i leave the work station, i usually forget to stop playing music and therefore, when i turn my iPhone, music switches to the one that played on laptop. Pretty often music stops playing at all, untill i change sound source from laptop to iphone and back one time. Then, when i get back to laptop - music from iphone is playing there. It's so irritating that sometimes i want to smash things out. I want to control the music myself and decide where to play what.