I have a problem with Marshal Major 2 Bluetooth hedphones and few other hedphones with aptX support. Sound is glitchy and is annoing to use this phone for wireless music expirience.
ENV:
1. Google Music
2. Bluetooth with aptX support (Marshal Major 2 Bluetooth in my case)

STR:
1. Set password for screen lock (any fingerprint or number password).
1a. Open 3-5 apps (optional)
2. Turn on Google Music with cached music.
3. Lock phone
4. Listen music about 10-15 minutes.
5. Try to unlock phone

Result: when you start to unlocking screen sound is glitchy and can even stop playing for a few seconds. same times it's glitching even on locked sreeen.

Just to check I turn on advance logging and check. Every time music strart to glitching aptx_media_work is most active process in system.

Reproducable on global stable(5.2.7.0G) and latest beta (6.7.1.17A) firmwares.


PS: headphons with wire work good. issue only with bluetooth headphones.