TeamSpeak3 changes audio when connecting to a server

Hi there,

when I normally use my Bluetooth Ear Buds (WF-1000XM3), they are just fine. But whenever I start TeamSpeak (3.5.6-1) and connect to a server, the audio devices get changed (a new microphone pops up) and the sound quality gets significantly worse (it sounds a bit like a telephone). As soon as I close TeamSpeak, the problem vanishes.
This problem has only been there since a month probably. The strange thing is, that I already tried downgrading teamspeak to a version where I am sure that it worked properly, but that didn’t fix it so TeamSpeak doesn’t look like to be the real root of the problem. I assume, that some broken version of e.g. pulseaudio or bluetooth got installed during a rolling update

Here is the log from TeamSpeak (have a look at SoundDevManager):

Crashdump ENABLED,  directory is: /home/daniel/.ts3client/crashdumps
DUMP defined! Dumpdir is: /home/daniel/.ts3client/crashdumps
2020-12-23 16:09:40.238040|INFO    |              |   |TeamSpeak Client 3.5.6 (2020-11-25 13:53:42)
2020-12-23 16:09:40.238109|INFO    |              |   |SystemInformation: Linux 5.9.11-3-MANJARO #1 SMP PREEMPT Sat Nov 28 09:08:57 UTC 2020 x86_64 Binary: 64bit
2020-12-23 16:09:40.238132|INFO    |              |   |Using hardware aes
2020-12-23 16:09:40.252106|DEBUG   |PulseAudio    |   |connected to pulse audio server - 
2020-12-23 16:09:40.268573|INFO    |ClientUI      |   |OpenGL Info: LibGL, Vendor: X.Org, Renderer: AMD Radeon(TM) Vega 8 Graphics (RAVEN, DRM 3.39.0, 5.9.11-3-MANJARO, LLVM 11.0.0), Version: 4.6 (Compatibility Profile) Mesa 20.2.3
2020-12-23 16:09:40.300101|INFO    |Addons        |   |Checking for addon updates...
2020-12-23 16:09:40.326232|INFO    |Plugins       |   |Loading plugin: librp_soundboard_linux_amd64.so
PLUGIN: registerPluginID: {2062f07c-7230-470d-8c49-3a8565064d32}
2020-12-23 16:09:40.328957|INFO    |Plugins       |   |Loading plugin: libclientquery_plugin_linux_amd64.so
2020-12-23 16:09:40.330245|INFO    |Query         |   |listening on 127.0.0.1:25639
2020-12-23 16:09:40.430725|DEBUG   |SB            |   |CurrentServerConnectionChanged: 1
ClientQueryPlugin: currentServerConnectionChanged 1 (0)
2020-12-23 16:09:40.451291|INFO    |Addon         |   |Addon up to date.
2020-12-23 16:09:40.491097|INFO    |              |   |*** Time [MAINWINDOW]: 230
2020-12-23 16:09:40.491194|INFO    |              |   |*** Time [INIT]: 230
2020-12-23 16:09:40.494286|INFO    |ClientUI      |   |Failed to init text to speech engine
2020-12-23 16:09:40.494389|INFO    |ClientUI      |   |Qt version: 5.12.1
2020-12-23 16:09:40.494421|INFO    |ClientUI      |   |Using configuration location: /home/daniel/.ts3client/settings.db
2020-12-23 16:09:40.496933|INFO    |Addon         |   |Addon up to date.
2020-12-23 16:09:40.647143|ERROR   |SB            |   |UpdateChecker: Error requesting version document https://mgraefe.de/rpsb/version/version_linux_amd64.xml.
                                                       Error-String: Error transferring https://mgraefe.de/rpsb/version/version_linux_amd64.xml - server replied: Not Found
2020-12-23 16:09:40.990328|INFO    |Bookmarks     |   |Collecting autoconnect bookmarks
2020-12-23 16:09:40.990722|INFO    |ClientUI      |   |Last update check was: Mi. Dez. 23 15:13:43 2020
2020-12-23 16:09:40.991039|INFO    |              |   |Statistics report: Not yet, next report on Sa. Jan. 23 16:13:11 2021
2020-12-23 16:09:41.490888|INFO    |Newsticker    |   |Newsticker next check: Mi. Dez. 23 20:08:52 2020 GMT
2020-12-23 16:09:42.832876|INFO    |ClientUI      |1  |Connect to server: ts.rewinside.tv
2020-12-23 16:09:42.837597|INFO    |ClientUI      |1  |Trying to resolve ts.example.com
2020-12-23 16:09:42.845167|INFO    |TSDNS         |   |SRV DNS resolve unsuccessful, "" Domain name not found
2020-12-23 16:09:42.845283|INFO    |TSDNS         |   |SRV DNS resolve unsuccessful, "" Domain name not found
2020-12-23 16:09:42.855777|INFO    |TSDNS         |   |A/AAAA DNS resolve for possible TSDNS successful, "example.com" =(h: 8<ip_here> p:0)
2020-12-23 16:09:42.869315|INFO    |TSDNS         |   |A/AAAA DNS resolve successful, "ts.example.com" =(h: 178.63.242.167 p:0)
2020-12-23 16:09:42.871376|INFO    |TSDNS         |   |A/AAAA DNS resolve for possible TSDNS successful, "example.com" =(h: 178.63.242.167 p:0)
2020-12-23 16:09:42.890452|INFO    |TSDNS         |   |TSDNS queried unsuccessfully <ip_here>:41144
2020-12-23 16:09:42.890653|INFO    |TSDNS         |   |No TSDNS found
2020-12-23 16:09:44.856047|INFO    |TSDNS         |   |TSDNS queried unsuccessfully 85.10.211.187:41144
2020-12-23 16:09:44.856161|INFO    |TSDNS         |   |No TSDNS found
2020-12-23 16:09:44.856314|INFO    |ClientUI      |1  |Lookup finished: ip=<ip_here> port=9987 query="ts.example.com" error=0
2020-12-23 16:09:44.856482|INFO    |ClientUI      |1  |Resolve successful: <ip_here>
2020-12-23 16:09:44.856559|INFO    |ClientUI      |1  |Initiating connection: <ip_here>
AA ts3.alsa.dummy.playbackdefault 5
2020-12-23 16:09:45.003681|INFO    |SoundDevManager|   |PulseAudio - Device removedbluez_sink.38_18_4C_7B_00_0D.a2dp_sink
2020-12-23 16:09:45.004823|INFO    |SoundDevManager|   |PulseAudio - Device added: bluez_sink.38_18_4C_7B_00_0D.headset_head_unit
2020-12-23 16:09:45.019812|INFO    |ClientUI      |1  |Connect status: Connecting
2020-12-23 16:09:45.062842|DEVELOP |PktHandler    |1  |Puzzle solve time: 3
2020-12-23 16:09:45.174910|INFO    |ClientUI      |1  |Connect status: Connected
2020-12-23 16:09:45.214349|INFO    |ClientUI      |1  |Connect status: Establishing connection
2020-12-23 16:09:45.429949|INFO    |ClientUI      |1  |Connect status: Connection established
2020-12-23 16:09:45.501071|DEBUG   |SB            |   |onUpdateClientEvent: serverId = 1, clientId = 2369, invokerID = 0, invokerName = "", invokerUID = ""
2020-12-23 16:09:45.501134|DEBUG   |SB            |   |Input state of server 1 enabled
2020-12-23 16:09:45.501153|DEBUG   |SB            |   |TSMGR: Setting active server id: 0 -> 1
2020-12-23 16:09:45.501202|INFO    |SB            |   |Server Id: 1ll
2020-12-23 16:09:45.526291|DEBUG   |SB            |   |onUpdateClientEvent: serverId = 1, clientId = 2369, invokerID = 0, invokerName = "", invokerUID = ""
2020-12-23 16:09:45.677959|DEBUG   |SB            |   |onUpdateClientEvent: serverId = 1, clientId = 15, invokerID = 0, invokerName = "", invokerUID = ""

Any ideas/suggestions how to fix this issue?
Sincerely,
Butzlabben