On premise and external Grandstream phones loosing connections

I have 2 different phone systems that are having random phones, both on-premise and external phones, drop connections. This problem started about 10 months ago when I changed over the extensions from chansip to pjsip. Since then random phones will loose connections. To get them back I will reboot the phone and about half the times that will reconnect the phone. One phone system is Freepbx 13 and the other is 14. I am using Grandstream GXP-2170 phones. Any help would be greatly appreciated. This is becoming a problem.


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