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Try loosening and re-tightening the screw at the collar. How are you storing it? Where are you putting it when you're not using it on the ice? DO NOT store it assembled, DO NOT stand it up when not in use, and DO NOT stand it in a half-hole on the ice. All of those put pressure on the auger and the drive, and cause them to warp. My old 8900 has some wobble to it, but honestly, it isn't the biggest deal in the world. Just be a little more careful with your stuff and it will stay pristine.
I have to say a Big Thank You to Mr. Rebelss!!! He is the man when it comes to these girls. He has helped me a couple times with my Stingray through pms and I have to give him two flags up. No I was not put up to this at all .Seriously though I really appreciate your help my friend. He wouldn't even take some ice jigs as a thanks, truly great guy. How is the ice up your way?
Put a drop of Loctite on the threads and tighten down.
Cabelas Canada has a Z71 on sale for $363... I'm going to jump all over it!!!