Will be locking this thread to consolidate reports as we currently have a stickied thread regarding the Level 3 issues here. As well this thread is starting deviate from the issue.
This is something that’s being looked into however keep in mind that this does look to be an issue routing through Level 3 and as the OP had mentioned, he’s had to route his customers around Level 3 to get this resolve. While we are looking into this, if you’re looking for an immediate fix\workaround, it’d be best to contact the ISP regarding the routing or a VPN can potentially be used to alter the routing.