PJSIP - All Extensions Dropped: Broken Pipe

Yesterday all extensions were dropped, the log is filled with:
20728[2022-12-07 21:34:34] ERROR[23909] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20729[2022-12-07 21:35:14] ERROR[29495] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20730[2022-12-07 21:35:54] ERROR[14649] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20731[2022-12-07 21:36:34] ERROR[14177] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20732[2022-12-07 21:37:14] ERROR[23909] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20733[2022-12-07 21:37:54] ERROR[29495] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182
20734[2022-12-07 21:38:34] ERROR[14649] res_pjsip.c: Error 120032 ‘Broken pipe’ sending OPTIONS request to endpoint 4182

Restarting asterisk resolved the issue - but what caused this?
Asterisk 18.14.0
FreePBX 16.0.26

You were using TLS or plain TCP, and the TCP connection was lost.

Yes, these are TLS connections.

Endpoints are same VLAN as the PBX, and they did not reconnect until after restarting asterisk.

I’m not seeing anything remarkable in the logs that would account for the connections dropping.

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