Same problem here on a ThinkPad X230 and Nothing Ear earbuds.
```
$ hciconfig hci0 -a
hci0: Type: Primary Bus: USB
BD Address: F4:B7:E2:E9:11:76 ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN
RX bytes:726870 acl:2037 sco:24602 events:2531 errors:1
TX bytes:1782457 acl:1985 sco:23912 commands:1195 errors:0
Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH SNIFF
Link mode: PERIPHERAL ACCEPT
Name: 'ThinkPad-X230'
Class: 0x7c010c
Service Classes: Rendering, Capturing, Object Transfer, Audio, Telephony
Device Class: Computer, Laptop
HCI Version: 4.1 (0x7) Revision: 0x16dd
LMP Version: 4.1 (0x7) Subversion: 0x220e
Manufacturer: Broadcom Corporation (15)
```
```
[ 74.807088] Bluetooth: hci0: SCO packet for unknown connection handle 6
[ 74.807111] Bluetooth: hci0: SCO packet for unknown connection handle 6
[ 132.243919] Bluetooth: hci0: corrupted SCO packet
[ 183.203819] Bluetooth: hci0: SCO packet for unknown connection handle 6
```
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https://bugs.launchpad.net/bugs/1430696
Title:
Bluetooth audio instability: Bluetooth: hci0 SCO packet for unknown
connection handle
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