At this point, between miles accumulated and time passed, the warranty is long since gone... even thought its been occurring for about six months. .
The thought, a few weeks ago, was that the disc had warped. To be quite honest, I slipped it (what I consider bad) once (that I remember) since the install... pulled out into traffic in 3rd. Not sure if that would have done it or not, but if so; I could not see it not happening to others.
If you come to a stop (in gear), you can actually feel the load against the gears when you try to pull it into neutral, and sometimes feel tooth to tooth when trying to get into gear.