As I stated in my PM...based on the symptoms you're describing (particularly needing to reboot the ATA and the no audio), it sounds like all of our traffic is not getting through your router to the ATA. This is an issue with some modern routers that tend to be a little too aggressive with filtering and manipulating traffic. To remedy this, setup port forwarding in your router to allow all of our traffic through. Please forward UDP ports 5004-65000 to the device and see if that resolves your issues.
This is very likely resolve your issues since it will make sure all of our traffic gets through.