I took another look at the gateway, and I just don't see anything wrong with it from my side. I think at this point I have to recommend replacing the gateway unit, as it seems like a hardware failure in the gateway.
Getting the exact same issues on my gateway, and it's already been replaced once for the rebooting issue. So I don't think it is the gateway's fault at this point. Is there anything you can look at? This things reboots at least 2-3 times a day, and it's been happening since I got it a few months ago.