I speak and write English as a second language. I run a spell & grammar check of everything before I post. I'm not trying to sound legalistic.
I know of no official fix. And I seriously doubt that Apple considers this an issue that needs a fix.
My point was that your MM doesn't have a problem, as it worked properly at the Apple store. It has a problem in your environment, your home. If Apple traded you another MM and it behaved the same way in your home, the problem would still be with your home, not with the MM. I don't think that is Apple's problem, unfortunately it is yours. And please, don't think me unfeeling for your situation. I wish you could have a MM that worked for you in your current environment. It's a great mouse. I love the scrollball. Both the left and right click work perfectly for me in my home, my environment. My hand just hasn't developed the coordination to use the side buttons.
I apologize for the chastising tone. You received the ire of my sensitivity to the topic. I have been in this forum almost from day one, trying to offer assistance for just about anything that has come up. Even to the point of extensively researching topics I don't know off the top of my head to give a hand, especially if no one else is responding. There are some folks around here who never pitch in a hand to help, but they are lurking in the peripheral shadows and the first note of general criticism about the iMac, the Intel chips vs AMD, the MM, the tactile feel of the Apple keyboard, the built-in speakers, the AirPort card, ad infinitum, and they jump on the bandwagon, claws bared, ready to get in their digs. (Is that too many mixed metaphors?)
For example, people have grimy fingers; dirt, oil, dead skin that sloughs off, etc. and eventually gum up the scrollball mechanism inside the mouse, so it needs to be cleaned. There have been countless threads of Apple's bad MM design because the scrollball needs to be cleaned occasionally, perhaps more often for some, than others.
Personally, I have grown weary of the moaners and complainers and the folks threatening to return to the dark side. (Windows) The general population falls on pretty much every scale someone can develop, as a bell curve, with the majority of folks in the middle and the minority on the fringes. In my estimation, of the population that would be attracted to its products, Apple shoots for the majority. The happy middle ground. The millions of folks for whom the MM works wonderfully.
But there will always be those who for whatever reason, and possibly not their fault, will fall on the fringes, where a product designed for the middle ground, doesn't work for them. And to them I say, adapt, and stop b*tching about it. Accept that something doesn't meet your need and customize by finding something that does, whether a different keyboard, a $19 mouse, external speakers, etc.