[WH-CH700N, playback] fails after a while

Whether I'm watching something, or doing something else whilst listening to playback, the playback stops and starts intermittently. Only happens on Bluetooth, not on Aux. CPU/RAM usage not high when issue occurs.

As well as this, my bluetooth driver is not supported out of the box, so had to download 3rd party firmware file. Firmware file from here: https://github.com/winterheart/broadcom-bt-firmware

Was the only solution that worked, possibly defective?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: tom 1395 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 11 19:18:26 2020
InstallationDate: Installed on 2020-04-10 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: WH-CH700N
Symptom_PulseAudioLog:
 Apr 11 18:52:45 tom-Laptop dbus-daemon[641]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.30' (uid=122 pid=820 comm="/usr/bin/pulseaudio --daemonize=no " label="unconfined")
 Apr 11 18:52:45 tom-Laptop dbus-daemon[641]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.37' (uid=122 pid=820 comm="/usr/bin/pulseaudio --daemonize=no " label="unconfined")
 Apr 11 18:56:08 tom-Laptop systemd[803]: pulseaudio.service: Succeeded.
 Apr 11 18:56:18 tom-Laptop systemd[803]: pulseaudio.socket: Succeeded.
Symptom_Type: Sound works for a while, then breaks
Title: [WH-CH700N, playback] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/08/2014
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.50
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Type2 - Board Product Name
dmi.board.vendor: Type2 - Board Manufacturer
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis ManuFacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDECorp.:bvr1.50:bd10/08/2014:svnTOSHIBA:pnSATELLITEL50-B:pvrPSKTUE-04L00VEN:rvnType2-BoardManufacturer:rnType2-BoardProductName:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
dmi.product.family: INVALID
dmi.product.name: SATELLITE L50-B
dmi.product.sku: INVALID
dmi.product.version: PSKTUE-04L00VEN
dmi.sys.vendor: TOSHIBA