Source is my boss telling me to make it that way. ;) Curious how you're getting the new one on occasion...that should be very consistent, unless some of your requests randomly come from a different IP, and our geoip DB thinks it's US?
Well, I'd be very happy to hear when your boss tell you that it's going to change - I'd love to get it here!
I don't believe there's any reason my IP would be identified differently, but I can tell that except for once on the first day this never happened again from any device here.