I'm having the same problem.
Either the sound drops in half or disappears entirely.
how to proceed? is this hardware failure?

Mail to support02@blackview.hk , after-sale help you.

Hello, my phone loses the sound within a few seconds of playing a video or a song, no matter whatsApp, Facebook and others. I've turned it back to factory values but it's still the same and it's a terrible thing on a mobile in a few months. I've also noticed buttons being activated on the screen when I zoom in on my face to talk by hanging the call or removing mute my voice

Daloa wrote:

Hello, my phone loses the sound within a few seconds of playing a video or a song, no matter whatsApp, Facebook and others. I've turned it back to factory values but it's still the same and it's a terrible thing on a mobile in a few months. I've also noticed buttons being activated on the screen when I zoom in on my face to talk by hanging the call or removing mute my voice

Hello, sorry to hear that. May I know which phone you have?

Yes, is a BV9800.

Bv9800

Daloa wrote:

Bv9800

Hello, sorry to reply you late. This is the problem of the speaker, the speaker needs to be replaced, you can contact our after-sale department to get one speaker: support02@blackview.hk

Daedelus wrote:

Yes, I have this same issue, glad to hear more people are having trouble with this. I have found multiple posts indicating Android 9 itself might be the culprit. 
Did some testing and tried reporting it (submit button not working) so sent it through mail to support02@blackview.hk

Below a summary of my form:

[color=#222222][size=100]Software Version:
BV9800_EEA_S65_V1.0_20191016v10_20191203-1020[/size][/color]
Your Feedback:
[color=#222222][size=100]Love this phone, but is has a very annoying issue which has impact on calls and primary function!

Two major symptoms:
- Using speaker, sound randomly dies after random period of use. Doesn't matter which app, no sound from speaker will work.

- Speaker is working for 1 second, sound "normalizes", then sound dies.
Switching apps, go back to video, sound plays very loud, gets normalized and dies in 1 second

I have tried the following:
- During call: enabled and disabled speaker
- Waiting
- Switching apps continously back and forth (1 second sound)
- Change all volume levels
- Enable and disable "Do not disturb"
- Enable and disable "Bluetooth"
- Enable and disable "Wireless"
- Enable and disable "Data"
- Enable and disable "Screen rotation"
- Left background apps open
- Killed all background apps
- Reinstalling apps
- Checked for updates, not available
- Rebooting phone

Results of testing:
-  No solution found.
Sometimes sound gets back and stays very loud.
Sometimes sound keeps gone.
Sometimes sound works with stuttering intervals of a few seconds/minutes
- Using headphones for music or calls, no issues found
- When headphones unplugged and no sound, it doesn't show headphone plugged in
- Using earspeaker (top speaker) for calls, no issue found when (bottom) loudspeaker fails
- Also affects calls!
Place phone call, enable speaker.
Other end will hear me fine, but speaker doesn't make a sound. When  switching to normal callspeaker no problem and I can hear other side. Back on (bottom) loudspeaker gives problems.

How to recreate:
- Play any sound content through speaker.
- Happens most often using Google Chrome or YouTube video (possibly due to being most used and thus noticed). When bug is live, no "music" sound can be produced.

- Will also happen randomly while using applications/games.

Seems like software issue, when switching application/forcing sound to restart it will often sound 1 second before killing sound.[/size][/color]

== end of form summary ==

Hi Daedelus
Is the problem solved by replacing the speaker or is it a software issue only?
Thx

hangglider wrote:

Daedelus wrote:

Yes, I have this same issue, glad to hear more people are having trouble with this. I have found multiple posts indicating Android 9 itself might be the culprit. 
Did some testing and tried reporting it (submit button not working) so sent it through mail to support02@blackview.hk

Below a summary of my form:

[color=#222222][size=100]Software Version:
BV9800_EEA_S65_V1.0_20191016v10_20191203-1020[/size][/color]
Your Feedback:
[color=#222222][size=100]Love this phone, but is has a very annoying issue which has impact on calls and primary function!

Two major symptoms:
- Using speaker, sound randomly dies after random period of use. Doesn't matter which app, no sound from speaker will work.

- Speaker is working for 1 second, sound "normalizes", then sound dies.
Switching apps, go back to video, sound plays very loud, gets normalized and dies in 1 second

I have tried the following:
- During call: enabled and disabled speaker
- Waiting
- Switching apps continously back and forth (1 second sound)
- Change all volume levels
- Enable and disable "Do not disturb"
- Enable and disable "Bluetooth"
- Enable and disable "Wireless"
- Enable and disable "Data"
- Enable and disable "Screen rotation"
- Left background apps open
- Killed all background apps
- Reinstalling apps
- Checked for updates, not available
- Rebooting phone

Results of testing:
-  No solution found.
Sometimes sound gets back and stays very loud.
Sometimes sound keeps gone.
Sometimes sound works with stuttering intervals of a few seconds/minutes
- Using headphones for music or calls, no issues found
- When headphones unplugged and no sound, it doesn't show headphone plugged in
- Using earspeaker (top speaker) for calls, no issue found when (bottom) loudspeaker fails
- Also affects calls!
Place phone call, enable speaker.
Other end will hear me fine, but speaker doesn't make a sound. When  switching to normal callspeaker no problem and I can hear other side. Back on (bottom) loudspeaker gives problems.

How to recreate:
- Play any sound content through speaker.
- Happens most often using Google Chrome or YouTube video (possibly due to being most used and thus noticed). When bug is live, no "music" sound can be produced.

- Will also happen randomly while using applications/games.

Seems like software issue, when switching application/forcing sound to restart it will often sound 1 second before killing sound.[/size][/color]

== end of form summary ==

Hi Daedelus
Is the problem solved by replacing the speaker or is it a software issue only?
Thx

Hello, maybe you need to replace a new speaker, or you could contact after-sale department: support02@blackview.hk

I have the same problem. Everything was working perfectly until about a week ago. Same problem as everyone here describes. Please fix it. This is unacceptable.