Bluetooth connection issues

Since I updated to Ubuntu 22.04, Bluetooth has been broken, and I cannot seem to connect my Bose QuietComfort 2 to my laptop.

My headphones are most of the time plainly refusing to connect, and the rare times I manage to connect them, they just disconnect or play garbled sounds.

I tried:

• messing with the /etc/bluetooth/main.conf file and putting Bluetooth to bredr;
• pairing through the bluetoothctl command;
• unpairing and pairing them again;
• using Blueman.

My laptop is a Lenovo IdeaPad 5 pro.

Result of the lspci -knn | grep Net -A3; lsusb:

03:00.0 Network controller [0280]: MEDIATEK Corp. MT7921 802.11ax PCI Express Wireless Network Adapter [14c3:7961]DeviceName: Realtek RTL8111E Ethernet LOMSubsystem: Lenovo Device [17aa:e0bc]Kernel driver in use: mt7921eBus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 003 Device 003: ID 13d3:56fb IMC Networks Integrated CameraBus 003 Device 002: ID 0489:e0cd Foxconn / Hon Hai Wireless_DeviceBus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub