Mouse loosing connection

I recently purchased a 27" iMac, which I love.
However, I am having some serious mouse issues. It constantly looses connection and just stops working till it reconnects which is anywhere from 1min to 5mins.
It's very annoying. What could be the problem? Is it something I can fix or is it maybe a defected mouse?
Any advice is appreciated
Thanks,
Jon

Depending your your point of view it could be considered "defective".  Problem is you are not alone.  There are many posts on the, er, deficiencies, of the MM.  Google "magic mouse looses connection" and look at More Like This section on the right.  Here's a 15-page thread on this topic in these forums:
Magic Mouse Loses Connection
Some of the problems appear to be a poor transmitter/receiver.  Others seem to be due to problems with the batteries used.  For example, different makes of batteries have slightly different lengths of the positive terminal (end with small "nib").  The tolerances are such that the slight length difference is enough to make the battery loose contact wth small movements of the batteries.  Some have found putting a small aluminum foil ball inside to take up the "slack".  Others have found different brands of batteries are less prone to the problem since they have larger positive terminals.
I do recommend always keeping a (cheap) wired mouse as a backup.  Keyboard too if you use a BT keyboard.

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    Click on the link to see more details and screenshots. 
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    http://support.apple.com/kb/ts3048
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    Hello again,
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