Something similar happened early last year if you look back once the hash rate went above a certain threshold blocks started taking forever.

The interesting part was people started to get fed up, so they started mining elsewhere and the hash rate dropped off substantially, then blocks started coming left and right. I even dug out some old Block Erupter cubes at the time and set them up. Obviously this was short lived then things reached a middle ground and now it seems we're right back at that point.