My Moto-G also has Foxfi, and it also shuts down and indicates my carrier will not allow use....Funny, My phone and I am locked out.
I guess it's time to dump Foxfi.
And I will look for a work around and get past this, so obtaining root is even more an emergency repair than a curiosity.
This control freak 'stuff' is getting ridiculous, carriers having control of private property, and WiFi is not connected to 'their' network, even by Foxfi, I use it for my own personal communication channels. Computer to computer, or phone to computer, my devices talk only to my other devices, or allowed devices on my network. I broadcast data to my repeater system, and Foxfi works well for this, and rarely shuts off or goes to sleep when the phone is running off of a power supply.