When my phone is connected to tv I am using bluetooth for the sound which keeps cutting out when there is no dialogue sound

May 13, 2018
I have a 12w kitsound slam bluetooth speaker and when I am watching a film on my phone via the tv, I have the speaker connected for the sound.
What I have found is that the sound will dissappear when nothing is happening on the film, then when dialogue starts there is a beep and the sound comes on again.
This happens very regular throughout the film and gets to be quite annoying.
Secondly the sound is up full but it needs to be louder. Would I need a bigger output.