Phone not re-registering

Hope someone can help me with this. I have a FreePBX install where most of the phones are on the same subnet as the server. Those all work as expected. There is one phone that is installed at a satellite office connecting over a VPN (handled by the routers). It is on a separate routed subnet. Once in a while there is a hiccup in the internet connection at the satellite office and the VPN get interrupted. When this happens the phone will not re-register once the VPN comes back up. I have tried rebooting the phone, and that does not help. The only thing that seems to work is is restarting dahdi & asterisk (through the web gui). I’m wondering if there’s a better/easier way. The PBX is and the phone is a Grandstream GVX3240 with the latest firmware.

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