Alex8000 wrote:

I have LEOPHILE ZERO Headphone, which is BT 4.1.
I have disable battery optimization for
-[b]Bluetooth MIDI service[/b]
-[b]BT Tool[/b]
-[b]Bluetooth sharing[/b]
-[b]Phone[/b]
-[b]Phone services[/b]
-[b]Call management[/b]
-[b]Phone/Messaging storage[/b]
- Microsoft Launcher
During long telephone calls the BT connection is stable, but I'm still getting "connection lost" and "connection successful" from the Headphone during idle. 
Sometimes I need to disable Bluetooth on the phone, and re-enable to get a stable BT connection with the phone.
No way to get a stable BT connection with the car.

As you can read, the workaround is not only about that. Please read carefully!

0) Consider updating your device to the latest firmware and performing a factory reset after that

1) Go to "Settings" -> "Background task clear"  and whitelist all your 3rd party apps wich need bluetooth to transfer data (i.e. samsung gear app, veryfit app and so on..). By doing that, they will be allowed to run in background even if the smartphone is in deep sleep state.

2) Go to "Settings" -> "Battery" -> "3 dots" in the upper right corner -> "Battery optimization" -> select "All apps" from the dropdown menu  and disable battery optimization for every bluetooth service app, as
- Bluetooth MIDI service
- BT Tool
- Bluetooth sharing

and for every app needing to use bluetooth to transmit data, as
- Phone
- Phone services
- Call management
- Phone/Messaging storage
- your 3rd party music player
- other telephone dialer apps
- fitness band apps and so on

3) Only if the previous steps doesn't solve your issue, also
- Go to "Settings" -> "Battery" and disable "Standby intelligent power saving"
- Go to "Settings" -> "Duraspeed" and and disable it.

4) Only if, again, the previous steps still don't solve your issue, also go to "Settings" -> "Battery" and set your device into "High performance mode"

Please follow these steps carefully and report

blackview_admin wrote:

Alex8000 wrote:

I have LEOPHILE ZERO Headphone, which is BT 4.1.
I have disable battery optimization for
-[b]Bluetooth MIDI service[/b]
-[b]BT Tool[/b]
-[b]Bluetooth sharing[/b]
-[b]Phone[/b]
-[b]Phone services[/b]
-[b]Call management[/b]
-[b]Phone/Messaging storage[/b]
- Microsoft Launcher
During long telephone calls the BT connection is stable, but I'm still getting "connection lost" and "connection successful" from the Headphone during idle. 
Sometimes I need to disable Bluetooth on the phone, and re-enable to get a stable BT connection with the phone.
No way to get a stable BT connection with the car.

As you can read, the workaround is not only about that. Please read carefully!

0) Consider updating your device to the latest firmware and performing a factory reset after that

1) Go to "Settings" -> "Background task clear"  and whitelist all your 3rd party apps wich need bluetooth to transfer data (i.e. samsung gear app, veryfit app and so on..). By doing that, they will be allowed to run in background even if the smartphone is in deep sleep state.

2) Go to "Settings" -> "Battery" -> "3 dots" in the upper right corner -> "Battery optimization" -> select "All apps" from the dropdown menu  and disable battery optimization for every bluetooth service app, as
- Bluetooth MIDI service
- BT Tool
- Bluetooth sharing

and for every app needing to use bluetooth to transmit data, as
- Phone
- Phone services
- Call management
- Phone/Messaging storage
- your 3rd party music player
- other telephone dialer apps
- fitness band apps and so on

3) Only if the previous steps doesn't solve your issue, also
- Go to "Settings" -> "Battery" and disable "Standby intelligent power saving"
- Go to "Settings" -> "Duraspeed" and and disable it.

4) Only if, again, the previous steps still don't solve your issue, also go to "Settings" -> "Battery" and set your device into "High performance mode"

Please follow these steps carefully and report

One thing to add to that list, Admin. Google's high accuracy location setting causes BT dropouts because it diverts the bluetooth to scan passing cars and tap into their locations, which is why your car BT connection can drop and then reconnect a second later when driving. This is an Android 7 and 8 bug. Only known fix is to go to Settings/Location, tap on three vertical dots at top right, tap on Scanning and turn off wifi and bluetooth scanning.

Neville wrote:

blackview_admin wrote:

Alex8000 wrote:

I have LEOPHILE ZERO Headphone, which is BT 4.1.
I have disable battery optimization for
-[b]Bluetooth MIDI service[/b]
-[b]BT Tool[/b]
-[b]Bluetooth sharing[/b]
-[b]Phone[/b]
-[b]Phone services[/b]
-[b]Call management[/b]
-[b]Phone/Messaging storage[/b]
- Microsoft Launcher
During long telephone calls the BT connection is stable, but I'm still getting "connection lost" and "connection successful" from the Headphone during idle. 
Sometimes I need to disable Bluetooth on the phone, and re-enable to get a stable BT connection with the phone.
No way to get a stable BT connection with the car.

As you can read, the workaround is not only about that. Please read carefully!

0) Consider updating your device to the latest firmware and performing a factory reset after that

1) Go to "Settings" -> "Background task clear"  and whitelist all your 3rd party apps wich need bluetooth to transfer data (i.e. samsung gear app, veryfit app and so on..). By doing that, they will be allowed to run in background even if the smartphone is in deep sleep state.

2) Go to "Settings" -> "Battery" -> "3 dots" in the upper right corner -> "Battery optimization" -> select "All apps" from the dropdown menu  and disable battery optimization for every bluetooth service app, as
- Bluetooth MIDI service
- BT Tool
- Bluetooth sharing

and for every app needing to use bluetooth to transmit data, as
- Phone
- Phone services
- Call management
- Phone/Messaging storage
- your 3rd party music player
- other telephone dialer apps
- fitness band apps and so on

3) Only if the previous steps doesn't solve your issue, also
- Go to "Settings" -> "Battery" and disable "Standby intelligent power saving"
- Go to "Settings" -> "Duraspeed" and and disable it.

4) Only if, again, the previous steps still don't solve your issue, also go to "Settings" -> "Battery" and set your device into "High performance mode"

Please follow these steps carefully and report

One thing to add to that list, Admin. Google's high accuracy location setting causes BT dropouts because it diverts the bluetooth to scan passing cars and tap into their locations, which is why your car BT connection can drop and then reconnect a second later when driving. This is an Android 7 and 8 bug. Only known fix is to go to Settings/Location, tap on three vertical dots at top right, tap on Scanning and turn off wifi and bluetooth scanning.

Thanks for your feedback dear! i'm adding it right now