A slight bump on mine, but this seems to be due to STM kicking in. I downloaded the same 4.7GB until I got managed (just before 4pm). It's interesting that, although on a smaller scale, the bump seems to have the same characteristics as the larger bumps seen on previous graphs. This would lead me to guess, completely unscientifically, that some kind of traffic management system is causing the bumps, perhaps one that has not (yet) been properly configured?
On the other hand, i know nothing about this stuff, so I'm probably talking nonsense.