One thing I forgot, I use AptX Bluetooth codec.
https://forum.xda-developers.com/an...-hd-bluetooth-stack-codec-cm13-t3530079/page3
I don't think it is related to your problem, but maybe you wanna try? It makes a big difference in sound quality on music playback.
Sent from my trltexx using XDA Labs
aptx only works if both appliances support it. If the bluetooth speaker does not have aptx-support, this flash is useless.
Tell me if i am wrong...