Just got off the phone with a tech at Sprint; the current problems we are having being reached or reaching many sites on the Internet is caused by someone on the network announcing bad BGP-4 routes onto the network. Typically this happens when a peering network misconfigures a router and announces routes for address space other than their own. This causes traffic for that address space to be routed to them instead of the proper network. They are working on chasing it down. Thank you for your patience.