Imagio as VoIP/WiFi phone

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I no longer have my Imagio on an active line, and I'd like to set it up as a VoIP phone running on my home WiFi network. The idea is that it'll stand in for a home phone line.

It was pretty easy to set up Fring and Sipgate, so I've got it working and it cane make and receive calls no problem. But the darn phone just won't stay connected to the WiFi network, and it can't receive calls when it's like that.

Is there any way I can force it to stay connected? It's not the network, because my laptop has no trouble staying connected.