google play music pausing when screen turns off, and other issues

I'm using stock marshmellow from lg. google play music pauses the song when the screen turns off. usually between 30 seconds and 2 minutes after the screen turns off. I'm not exactly sure if it pauses the song or the audio just cuts off. I've added google play music to ignore battery optimizations and that didn't help.

another issue I'm having is after I reboot the phone, play music doesn't detect my songs. the sd card is mounted but there is no music in play music. sometimes remounting the sd card doesn't work and I have to reboot. also, after rebooting, my playlist is empty.

Anyone having trouble with Spotify pausing

I note that since Oxygen 3.2.1 - my Spotify seems to pause whenever I put the phone down!

I bluetooth the audio to my car and I noted it started randomly pausing, but it seems it's more to do when I put the phone down, like it's a gesture or something.

Anyone else??