Trouble with standard asset FPS controller sometimes getting stuck against walls

[createasaurus]

I know this is more of a general Unity question.  But I wonder if anyone here has solved this...

When I walk up to a wall, sometimes the character sticks to it, and cannot move away.  If I jump I can free myself.  I'm wondering if there is some basic setting to help avoid this.

Details:
This is the Rigid Body FPS standard asset.
I build a very simple test geometry room, still have the problem.
I toggle on and off zero friction physics material - no effect.

Thank you.

[Beefdoctor]

In Your Character Controller your skin width value might be too small?