Bluetooth Wireless Keyboard acting as if keys are pressed

I've had an Apple Aluminum Bluetooth keyboard for over two years, and last week (after a fresh install of OS X Lion on my late 2009 Mac Mini) all of a sudden the Mac is acting as if multiple keys are pressed when nothing is touching the keyboard. I have updated all software, replaced the batteries, deleted and re-paired the keyboard (which was a massive struggle as it acted as if keys were depressed even during the pairing process). Nothing has ever been spilled on the keyboard. The only way to make the sound of the "phantom depressed key" go away and regain full control of the computer, is to remove the batteries from the keyboard.
Strangely, the problem seemed to have been resolved somehow after I placed the "Show character viewer" icon in the main menu (ie. where there is usually a US/other nationality flag). After doing so, all of a sudden the problem disappeared.
Now, exactly a week later, the problem has reappeared.
Can anyone explain why a keyboard would act this way? Has anyone had a similar problem? Is there a fix?
I'm a longtime reader of theese support discussion boards, but this is the first time I've posted. Let me know if there's information that I can provide that would help us solve this issue.
Cheers.

I have similar issue: both left and right shift keys time to time being pressed, it disappears after a while...but once I couldn't log in as the shift option puts caps lock on....really annoying.
The only reason in my case is the keyboard cleaning that I have done recently...
There is no quick fix for this I am afraid.
Options:
1.Apple replaces the keyboard you pay around £200 I think....
2. Buy new keyboard on Ebay and replace it yourself £40....
http://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2010+Keyboard+Replac ement/23632#s61162
Anyway lets see.

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