Magic Mouse Disconnecting When Closing MacBook Pro Using External Display

I have a 2009 MacBook Pro. I am trying to use it in sleep mode with an Apple wireless keyboard and a Magic Mouse. Everything appears to be connected fine. When I close the lid on my MacBook, I click my mouse and the external display comes on for a few seconds, then it cuts out and doesn't come back. I have the Bluetooth device can wake the computer up from sleep checked. When I have the MacBook open, the external display works fine. I only lose the external display a few seconds after I close the lid on my MacBook Pro.
I have made the Magic Mouse and keyboard favorites and it didn't help.
Does anyone have any idea? I am running 10.6.8.
Thanks

GaryKing, can you review how you reset the .plist files for both the Bluetooth keyboard and mouse?
I had nothing but good things to say about the Bluetooth keyboard and mouse, until I hooked up my 22' Samsung display to my MBP. Power shouldn't be an issue because it's being plugged into the outlet and the external monitor isn't taking power from the MBP. However, my keyboard will keep popping up with the notice "Connection Lost" every 5 or so minutes. Even now, I'm already on the next paragraph but the letters are slowly coming up one by one - it's not registering as fast.
The mouse experienced the same issue if I'm downloading a lot of files, it will lag behind to the point where I'll drag the mouse to where I want it to be, then a few seconds later it'll pop up where it should, that's how bad the lag is. I thought perhaps restarting the computer will do, but no, and also everything is up-to-date so there are no updates to worry about.
GaryKing, if you can go over how you reset the .plist files, that would be much appreciated. By the way, it's past a week since your post, how have the Bluetooth devices been working? Did the reset solve the lag issue permanently, or was is just a temporary fix?

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Magic Mouse Disconnecting When Closing MacBook Pro Using External Display

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