I've also noticed that attempting to connect to the RT31P2 can get it to reboot.
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If that's the case, it sounds like it's either drastically mis-configured, or it's dying a slow death.
Or you have a loop.
I had weird things a few years ago where I hooked a router wan back to a switch. The switch was on the WAN side, so that made things crazy!
That is related to "Loops and Spanning Trees" and only hi-end routers/switches can usually safeguard for that.
Most home networks are simple enough that this is unlikely. I had about 12 headless LINUX machines under my stairs booting from the network. It was a messy setup.
Can you get a different ATA? There are other models that offer router functionality along with VoIP lines. Doesn't Voipo allow provisioning of certain Grandstream models now?