That would be my guess. Although, if the servers for the west coast are having issues, you'd think they would be working harder to improve it. Or it could just be your Xbox for some reason. I know my first Xbox was really odd where every now and then my NAT would be Strict for no reason, or I would not be able to connect to LIVE.. Then I would just run the "Test Xbox Live Connection" and it would fix everything. Random, right?