Pjsip becoming Unreachable

Hi folks, I have a little problem with some extensions.
During the day they become Unrechable and Rechable a lot of times, and because of this I can’t make a call for them, but they can call me.
In the log, it appears like this:

[2024-05-20 10:22:22] VERBOSE[1270] res_pjsip_registrar.c: Added contact 'sip:103@xxx.xxx.xxx.xxx:5062;x-ast-orig-host=yyy.yyy.yyy.yyy:5062' to AOR '103' with expiration of 3600 seconds
[2024-05-20 10:22:22] VERBOSE[1270] res_pjsip_registrar.c: Removed contact 'sip:103@xxx.xxx.xxx.xxx:2244;x-ast-orig-host=yyy.yyy.yyy.yyy:5062' from AOR '103' due to remove existing
[2024-05-20 10:22:22] VERBOSE[18911] res_pjsip/pjsip_options.c: Contact 103/sip:103@xxx.xxx.xxx.xxx:2244;x-ast-orig-host=yyy.yyy.yyy.yyy:5062 has been deleted
[2024-05-20 10:22:22] VERBOSE[19772] res_pjsip/pjsip_configuration.c: Endpoint 103 is now Reachable
[2024-05-20 10:22:22] VERBOSE[19772] res_pjsip/pjsip_options.c: Contact 103/sip:103@xxx.xxx.xxx.xxx:5062;x-ast-orig-host=yyy.yyy.yyy.yyy:5062 is now Reachable.  RTT: 20.591 msec
[2024-05-20 10:23:25] VERBOSE[31650] res_pjsip/pjsip_configuration.c: Endpoint 103 is now Unreachable
[2024-05-20 10:23:25] VERBOSE[31650] res_pjsip/pjsip_options.c: Contact 103/sip:103@xxx.xxx.xxx.xxx:5062;x-ast-orig-host=yyy.yyy.yyy.yyy:5062 is now Unreachable.  RTT: 0.000 msec

This extension 103 has the same config as other extensions and is in the same network. I don’t know why this extension has this problem.
Can you help me?

Here is some information:

PJPROJECT version currently running against: 2.10
Asterisk 16.25.3 built by mockbuild @ jenkins7 on a x86_64 running Linux on 2022-04-28 12:35:42 UTC

Thank you.

Overloaded network, or dynamic rule in router or firewall timing out.

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