You kernel log is showing a problem at the kernel level:
[ 349.209981] iwlwifi 0000:05:00.0: Microcode SW error detected. Restarting
0x2000000.
[ 349.210223] iwlwifi 0000:05:00.0: Start IWL Error Log Dump:
[ 349.210228] iwlwifi 0000:05:00.0: Status: 0x00000100, count: 6
[ 349.210231] iwlwifi 0000:05:00.0: Loaded firmware version: 29.1044073957.0
...
Please try this:
sudo apt update
sudo apt install --reinstall linux-firmware gnome-bluetooth
Then reboot.
If the problem still persists then please:
1. Run:
dpkg -l > allpackages.txt
and send us the file 'allpackages.txt'.
2. Reproduce the problem again and then run:
journalctl -b0 > curjournal.txt
and send us the file 'curjournal.txt'.
** Changed in: bluez (Ubuntu)
Status: New => Incomplete
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
** Also affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-firmware (Ubuntu)
Status: New => Incomplete
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1831995
Title:
Bluetooth earphone is connected but disconnected immediately. [Intel
3165]
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1831995/+subscriptions
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