Random station registration loss

We have around 70 phones registering directly to FreePBX 14.0.5.25 on a local vlan without any NAT.

For some reason, we are seeing random registration loss that last between 1 and 2 minutes.

[2019-03-26 14:27:35] VERBOSE[17882] res_pjsip/pjsip_configuration.c: Endpoint 7053627371 is now Unreachable
[2019-03-26 14:27:35] VERBOSE[17882] res_pjsip/pjsip_options.c: Contact 7053627371/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 15:50:31] VERBOSE[17882] res_pjsip/pjsip_configuration.c: Endpoint 7053624761 is now Unreachable
[2019-03-26 15:50:31] VERBOSE[17882] res_pjsip/pjsip_options.c: Contact 7053624761/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 15:57:31] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 15:57:31] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 16:09:10] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 16:09:10] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 16:25:11] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 16:25:11] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 16:40:11] VERBOSE[14164] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 16:40:11] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 16:55:11] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 16:55:11] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 17:01:11] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 17:10:11] VERBOSE[17882] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 17:10:11] VERBOSE[17882] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 17:25:12] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 17:25:12] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 17:40:12] VERBOSE[14164] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 17:40:12] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 17:55:12] VERBOSE[14164] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 17:55:12] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:01:12] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:10:12] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 18:10:12] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:16:12] VERBOSE[17882] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:25:12] VERBOSE[5292] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-26 18:25:12] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:25:35] VERBOSE[14164] res_pjsip/pjsip_configuration.c: Endpoint 7053628903 is now Unreachable
[2019-03-26 18:25:35] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053628903/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 18:32:58] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053624761/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-26 19:36:06] VERBOSE[5292] res_pjsip/pjsip_options.c: Contact 7053628841/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-27 02:39:58] VERBOSE[14164] res_pjsip/pjsip_configuration.c: Endpoint 7053624761 is now Unreachable
[2019-03-27 02:39:58] VERBOSE[14164] res_pjsip/pjsip_options.c: Contact 7053624761/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec
[2019-03-27 02:39:58] VERBOSE[17882] res_pjsip/pjsip_configuration.c: Endpoint 7053621114 is now Unreachable
[2019-03-27 02:39:58] VERBOSE[17882] res_pjsip/pjsip_options.c: Contact 7053621114/sip:[email protected]:5060 is now Unreachable. RTT: 0.000 msec

I know some of these registration loss are probably just the ATA being rebooted by the end user.
But we have confirmation from end users that many of these happen with no reboot whatsoever.

Anyone can help me troubleshoot this issue further and tell me which log file I should be looking at?
Any extra logging I should enable?

Asterisk version is 15.7.1

I have something like that but in my case I loose all registered extensions until and Asterisk need to be restarted to get them back to work.

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