Physics objects will occasionally display strange glitches, as though receiving very large forces from nowhere. This tends to occur with mesh colliders that are in continual contact with other colliders, especially with physics materials.

Reproduction Steps:
1. Run the attached project
2. Watch as the polyhedrons continually fall and slide along the surface
3. Observe that occasionally some of the objects will fly off at random for no reason

Reproducible in versions 2017.2.0b7, 2017.2.0f1.
Not reproducible in versions 2017.1.1p3, 2017.2.0b6, 2017.3.0b2.