Phones go offline for a few minutes randomly from time to time

I’m having a strange issue since a few months, my aastra i53 phones go offline for 2 to 3 minutes without any clear reason and it aren’t the same extentions all the time they differ. what i found in the Full logs is

[2018-08-22 13:07:16] VERBOSE[15915] res_pjsip_registrar.c: Added contact ‘sip:[email protected]:5060’ to AOR ‘206’ with expiration of 60 seconds
[2018-08-22 13:07:16] VERBOSE[26508] res_pjsip/pjsip_configuration.c: Endpoint 206 is now Reachable
[2018-08-22 13:07:16] VERBOSE[26508] res_pjsip/pjsip_options.c: Contact 206/sip:[email protected]:5060 is now Reachable. RTT: 29.869 msec
[2018-08-22 13:09:13] VERBOSE[26508] res_pjsip/pjsip_options.c: Contact 204/sip:[email protected]:5060 has been deleted
[2018-08-22 13:09:13] VERBOSE[26508] res_pjsip/pjsip_configuration.c: Endpoint 204 is now Unreachable
[2018-08-22 13:09:49] VERBOSE[20020] res_pjsip_registrar.c: Added contact ‘sip:[email protected]:5060’ to AOR ‘204’ with expiration of 60 seconds
[2018-08-22 13:09:49] VERBOSE[26508] res_pjsip/pjsip_configuration.c: Endpoint 204 is now Reachable
[2018-08-22 13:09:49] VERBOSE[26508] res_pjsip/pjsip_options.c: Contact 204/sip:[email protected]:5060 is now Reachable. RTT: 30.265 msec

Could somebody help me with this issue.

FreePBX 14.0.3.6
Current Asterisk Version: 13.22.0

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