I initially that the problem was the coupling was either stripped or loosely connected to the auger. Ended up stripping screw head and had to rebuild with new Auger and Screw and changed the coupling out for good measure. Re-assembled and re-installed. Same problem.
I then removed ice bin. removed to screws in door and removed drive shaft. Noticed that the spot below washers on shaft was devoid of grease. This indicated the washer slid up, or shaft slid down, depending on your perspective. Re-positioned washer so that more of shaft was exposed and could interface with the coupling. Re-installed ice-bin. Good as new.