Extensions Hangup on Queue Calls

FreePBX 16.0.21.9 Asterisk 18.13.0 All Current Updates

I am sporadically getting extensions hanging up on queue calls as soon as they are answered. Here is a common example:

[2022-08-05 09:37:46]  app_queue.c: Local/[email protected];1 answered SIP/comcast-sip-00000676
[2022-08-05 09:37:46]  app_queue.c: Delaying member connect for 1 seconds
[2022-08-05 09:37:46]  bridge_channel.c: Channel SIP/205-0000069a joined 'simple_bridge' basic-bridge <ec91ef8e-2e9e-4c52-904a-bd2a8359e0b2>
[2022-08-05 09:37:46]  bridge_channel.c: Channel Local/[email protected];2 joined 'simple_bridge' basic-bridge <ec91ef8e-2e9e-4c52-904a-bd2a8359e0b2>
[2022-08-05 09:37:46]  bridge_channel.c: Channel SIP/205-0000069a left 'simple_bridge' basic-bridge <ec91ef8e-2e9e-4c52-904a-bd2a8359e0b2>
[2022-08-05 09:37:46]  bridge_channel.c: Channel Local/[email protected];2 left 'simple_bridge' basic-bridge <ec91ef8e-2e9e-4c52-904a-bd2a8359e0b2>

As you can see, ext 205 joined and left the bridge immediately. I can’t figure out WHY??? SIP just shows a BYE coming from extension with no explanation.

The phones are the current version of Bria Enterprise. This happens on about 1 call in 10, though some extensions seem unaffected. (Or maybe just unreported.)

Any suggestions appreciated.