Sometimes answers sometimes doesn't

I installed latest version of Asterisk and have completed all the module upgrades etc. I use to route my calls to the server. For the past couple of days if I call my phone number the server will put the call through the first or second time. After that if I call the phone will ring and ring then rolls to the callcentric box stating that I can be reached at the moment. Is there some setting I am missing or need to change. It’s almost like my server is going into sleep mode…Once I get home if I open freepbx and just resave the extension settings it works again. Any help is appreciated.