After apt packages upgrading to the latest version, today I tested 7
hours (continuous Netflix video watching ). It didn't happen again. I
guess the bug is fixed by someone.

I still leave files here.  I guess It may help for researching.

** Attachment added: "a2dp_situation_report.tar.gz"

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.

  Bluetooth A2DP audio device disconnect automatically after long time
  using (almost 49mins)

Status in pulseaudio package in Ubuntu:

Bug description:
  After upgrading Ubuuntu 18.04 LTS to 20.04 , when I watching
  Netflix(by  Firefox) videos with my  bluetooth speaker (Lasonic
  i931BT), I found that almost every 49mins ,the video suddenly slow
  down and then sound stop transmitting to my speaker. It shouldn't

  I check the pulseaudio mixer's output device. My speaker dissappeared.
  Only "Dummy Output " showed. (As the screenshot ) Everytime, I need go
  to bluetooth manager to disconnect the speaker, and wait it
  automatically connects again. Sometimes it works, but sometimes does
  not. I need to reboot to fix it (Power off the speak won't help ).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: pulseaudio-module-bluetooth 1:13.99.1-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-18.22-lowlatency 5.4.24
  Uname: Linux 5.4.0-18-lowlatency x86_64
  ApportVersion: 2.20.11-0ubuntu20
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Mar 18 23:13:06 2020
  InstallationDate: Installed on 2020-03-10 (8 days ago)
  InstallationMedia: Ubuntu-Studio 20.04 LTS "Focal Fossa" - Alpha amd64 
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install) 10/14/2019
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 1.07.06TCOP
  dmi.board.asset.tag: Tag 12345 ZX Series
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: COPELION INTERNATIONAL INC.
  dmi.chassis.version: N/A
dmi:bvnINSYDECorp.:bvr1.07.06TCOP:bd10/14/2019:svnCOPELIONINTERNATIONALINC.:pnZXSeries:pvrNotApplicable:rvnCOPELIONINTERNATIONALINC.:rnZXSeries:rvrNotApplicable:cvnCOPELIONINTERNATIONALINC.:ct10:cvrN/A: Not Applicable ZX Series
  dmi.product.sku: Not Applicable
  dmi.product.version: Not Applicable

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