Character controller gets stuck on stairs unity 4 scene import to unity 5

I have a scene with a character controller in it and some stairs with a bannister on either side of the steps. The steps are made of overlapping box colliders and the bannister is a simple mesh model that runs up either side.

In my unity 4.6 build, the character controller can go up and down the stairs all day long without a problem.

In unity 5, the character controller gets stuck sometimes and won't budge with moving it in the editor. I have no idea what is causing it to get stuck but its broken the game.