I've been using Redmi Buds 4 Pro TWS headphones for several years now.
everything was fine before. However, recently a problem has appeared:
The headphones connect and work well if you listen to music in the player or
browser, but if you make a call on telegram or discord, the system starts
switching the audio output from the headphones to the speakers and back in an
endless loop.

in journalctl I see the following line:
> июн 23 20:47:03 home.itrus.su telegram-desktop[16719]: qt.gui.imageio.jpeg: Corrupt JPEG data: premature end of data segment
> июн 23 20:47:09 home.itrus.su bluetoothd[1354]: /org/bluez/hci0/dev_6C_D3_EE_5A_B5_8D/sep2/fd5: fd(30) ready
> июн 23 20:47:11 home.itrus.su kded6[5481]: Registering ":1.131/StatusNotifierItem" to system tray
> июн 23 20:47:11 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:11 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:11 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:11 home.itrus.su kded6[5481]: Service  ":1.131" unregistered
> июн 23 20:47:11 home.itrus.su kded6[5481]: Registering ":1.132/StatusNotifierItem" to system tray
> июн 23 20:47:11 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:13 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:13 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:13 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 69
> июн 23 20:47:14 home.itrus.su kded6[5481]: Service  ":1.132" unregistered
> июн 23 20:47:14 home.itrus.su kded6[5481]: Registering ":1.133/StatusNotifierItem" to system tray
> июн 23 20:47:14 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:14 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:14 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:15 home.itrus.su kded6[5481]: Service  ":1.133" unregistered
> июн 23 20:47:15 home.itrus.su kded6[5481]: Registering ":1.134/StatusNotifierItem" to system tray
> июн 23 20:47:15 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:17 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:17 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:17 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 69
> июн 23 20:47:17 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 64
> июн 23 20:47:17 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 64
> июн 23 20:47:17 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 64
> июн 23 20:47:17 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 64
> июн 23 20:47:18 home.itrus.su kded6[5481]: Service  ":1.134" unregistered
> июн 23 20:47:18 home.itrus.su kded6[5481]: Registering ":1.135/StatusNotifierItem" to system tray
> июн 23 20:47:18 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:19 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:19 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:19 home.itrus.su kded6[5481]: Service  ":1.135" unregistered
> июн 23 20:47:19 home.itrus.su kded6[5481]: Registering ":1.136/StatusNotifierItem" to system tray
> июн 23 20:47:19 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:21 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:21 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:21 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 64
> июн 23 20:47:21 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 63
> июн 23 20:47:21 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 63
> июн 23 20:47:21 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 63
> июн 23 20:47:22 home.itrus.su kded6[5481]: Service  ":1.136" unregistered
> июн 23 20:47:22 home.itrus.su kded6[5481]: Registering ":1.137/StatusNotifierItem" to system tray
> июн 23 20:47:22 home.itrus.su plasmashell[5559]: QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
> июн 23 20:47:22 home.itrus.su kded6[5481]: Service  ":1.137" unregistered
> июн 23 20:47:22 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:22 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:24 home.itrus.su kdeconnectd[5775]: 2024-06-23T20:47:24 org.kde.pulseaudio: No object for name "bluez_output.6C_D3_EE_5A_B5_8D.1"
> июн 23 20:47:25 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 63
> июн 23 20:47:25 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 62
> июн 23 20:47:25 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 62
> июн 23 20:47:25 home.itrus.su kernel: Bluetooth: hci0: SCO packet for unknown connection handle 62

I tried several usb bluetooth adapters on different chips, the behavior does
not change when changing the adapter.


Unfortunately, I could not understand the reasons for this behavior, so I hope
for help.