Playback switches device when on same connection

[J-P1]

Plan

Premium

Device

PC and Android

My Question or Issue

Ok let me explain. My PC, which is connected to the Internet, plays music on spotify. Then I go take a **bleep**. Pull out my android phone and activate wifi (I don't always keep it on). As soon as my phone connects to the wifi, my music stops playing on my PC. Why would anyone want that? Like, if you really want to associate the devices together, keep the damn song playing for the love of god! It's not like I can get up and resume playback on my pc. Looking for a fix. Thanks