IMac (Early 2009) Bluetooth connection keeps dropping out

I have an iMac (20-inch, Early 2009) that I love.  I've used this machine for the past 3 years for absolutely everything.  It's my primary computer.  There is one issue that is driving me absolutely insane though.
On this machine, at random intervals my bluetooth keyboard or mouse will disconnect while I'm using it.  Then, if I click the mouse or press a key on the keyboard for a few seconds, the device will re-connect.  I have a Bluetooth keyboard and mouse (both Apple-branded) connected at the same time, but only one of the devices disconnects at a time.  If the mouse disconnects, the keyboard will stay connected  If the keyboard disconnects, the mouse stays connected.
This has happened on Mac OS X 10.6 Snow Leopard, 10.7 Lion, and 10.8 Mountain Lion.  It has happened with the new aluminum Apple Wireless Keyboard and the white plastic Apple Wireless Keyboard.  It has happened with the new Magic Mouse and also the older Mighty Mouse.
I've re-installed the operating system several times, and I'm running the latest software for both the Bluetooth chipset in the iMac and the keyboard/mouse.  I've also completely replaced the RAM in the machine, so it's not an issue with bad RAM.
The keyboard and mouse work on my MacBook Pro (same OS, same processor, same amount of RAM, same age) without any issues.  The keyboard also works with my iPad.  In the same exact area of my home, this problem only occurs on the iMac.  When the iMac is in different locations (or even at another home or office) the problem still occurs.  I don't think it's a problem with interference, nor is it a problem with the keyboard/mouse.
I know that when the batteries get low, this problem can happen very frequently, as that's happened to me in the past.  Whenever this occurs, the keyboard and mouse both have battery life above 75%.  It even happens when brand new batteries are in the devices.
For a while it seemed that this only happened when there was a lot of network activity (like if I was using the Finder to copy multiple large files over the network from my file server or another Mac to this machine), and the mouse tracking would start to get really, really slow before it would disconnect.  It was pretty easy to predict when the disconnect was going to happen.  Now, however, it happens at random.  I can be in the middle of dragging something from one window to another and the mouse will disconnect.  I can be in the middle of typing a sentence and the keyboard will disconnect.  There is no warning, and it happens even if there is very little activity on the machine.
I'm wondering if anyone else has had this problem.  My iMac is no longer under Apple's warranty, and I don't have AppleCare for it.  I plan on keeping this machine for a few more years, and am probably going to have to open it up at one point because the LCD has some faded vertical stripes that, while not a huge problem, are kind of obnoxious when watching a video or working on things that have a dark colored background.  Is the Bluetooth chipset and the WiFi chipset removable on this model of iMac?  From what I can remember, back in the iMac G5/Power Mac G5 days, the AirPort Extreme card had WiFi and Bluetooth on it, and it was removable.  Is that the case with this iMac, or will I have to replace the entire board?  Or, does anyone have another idea on how to resolve this problem?
I love this computer and I want to keep it for a few more years.  I also like keeping the original peripherals (or at least peripherals from the same manufacturer and time period) with my machines, so switching to a Logitech or Microsoft keyboard/mouse set with its own USB dongle isn't that appealing to me, and it's getting much harder to find USB keyboard and mice (from Apple) that are brand new or in decent condition.  I also don't know if it's possible to add a USB dongle to this machine if it already has an integrated Bluetooth chipset.
Any suggestions or assistance would be very much appreciated.

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