Road Runner / Sprint routing / DNS issues this morning?

I've had a steady trickle of reachability complaints coming from Road Runner users over the course of the day today. I started seeing wackiness about 7:30AM Eastern this morning when a VPN tunnel into a Road Runner customer dropped off. It seems as if the problems have stabilized over the last hour or so, but I'm curious as to what happened. I'm hearing rumors of some type of Road Runner outage and/or DNS problems and/or general routing brokenness that may or may not have involved Sprint. (How's that for specificity?) Any truth to the rumors, or can anyone provide more detail? Thanks, Andrew Cruse