Phone registers only after Asterisk reboot

We use FreePBX 15.0.21 in a small office setting, and it works great most of the time. I also have a phone connected to the server at home, which has a small problem. Occasionally the phone loses connection to the server (could be a power glitch on either side or something else), which disconnects the phone. the phone then shows a “no service” status. I can wait or restart the phone, and nothing changes. Only when I reboot the server will the connection be restored. Is that normal?

The phone connects to my home ethernet network, and to the server through the office firewall. Are there any additional ports I need to open for an automatic re-connect?

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