Have had the same exact problem and for almost 2 months, but i just found out it is also happening in with itunes which should mean the problem is in windows? Because i am 100% sure it's not my BT headphones since they have worked fine for more than 2 years.
No one have a solution yet? I dont want to use the online webplayer anymore, it's**bleep**.
I've done some more experimenting and I think this issue might be related to aptX which is the bluetooth codec used when listening to music through bluetooth earphones.
When my computer is using a difference bluetooth codec (SSO for example) the issue does not occur (though the audio quality is aweful due to bluetooth limitations). I've tried this on a mac which switches to SSO when I'm using the mic on my earphones.
So if I'm using the mic then the issue doesn't occur
I'll test this out on my windows work computer next week to see if it's the same there.
Re: Pausing Spotify Playback "Mutes" ALL Audio Playback On My Computer