Macbook goes to sleep randomely when connected to Apple LED Display

I have  an issue with my Macbook Pro (2009 model) when it's connected to my 27' Apple LED Display. For no apparent reason that I can tell, it just goes to sleep at random, and after I wake it up by pressing a key (bluetooth keyboard), the mouse cursor looks messed up:
It might be a bit hard to tell from the blurry photo (I don't know of a way to take a screenshot with the cursor, so I used my iPhone), but it's too halves of the spinning beachball.
There's nothing in the console's log that indicates the reason for switching to sleep mode. It's also not the magnets of the Macbook pro used to detected when the lid is closed (I'm using the NoSleep utility that prevents that behavior). I've already tried resetting the PRAM. Also, this behavior never happens when the macbook isn't connected to the external display, so that probably aint a heating problem either (also the temperature readings are all in bounds).
Any help would be very appreciated, as that thing is driving me crazy.

Jon,
Along the lines of my comment in your other thread. The battery connection cable between the logic board and the battery is also known as the "sleep/switch" connector. This little cable not only communicates battery power to & from the machine but also has a handle on regulating the machine's sleep process (and wake from sleep).
I've seen several MacBooks that have come across my work bench which are suffering from this exact issue you're describing and we're remedied by replacing that cable.
The component I'm referring to is this one-
http://www.ifixit.com/MacBook-Parts/MacBook-Battery-Connector-Sleep-Sensor-non-E nergy-Star/IF186-015

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