I felt the same way not too long ago--I was having deja vu spells that seemed just a little too recurrent, and I was freaked.
This article made me feel better--basically, deja vu is just misplaced chemicals in your brain. While the mental reset you experienced is a little more concerning, my guess is it's something similar.
There's another article that seems to describe your situation (a little scary, but ultimately it says that women face greater stress now than they ever have before, and stress has been linked in many ways to forgetfulness).
We all have our own flavors of crazy. :p