Problem with Magic TrackPad and Macbook Pro

I just bought the Apple Wireless Keyboard and Apple Magic TrackPad for my home desktop setup. I connect my Macbook Pro 13" (from august 2010) to a Dell U2410 screen.
Everything works perfectly for a while, but then the cursor starts jumping around on the screen when I use the Magic TrackPad. Now here comes the weird thing, if I open the lid on the Macbook just a few inches the jumping stops completely and the Magic TrackPad works perfectly again.
I have tried googling a bit and browsed these forums also - no luck finding a solution.
I have also tried connecting a USB mouse to the Macbook when the cursor started to jump around - no problem with the USB mouse. I have also tried a different Magic TrackPad that my friend also just have bought for his setup - same problem after a short time.
Everything is updated to the latest software and firmware.
Thank you in advance for your help.

I have the same problem with a Trackpad paired with a new Mac Mini just purchased in September. After a while, my trackpad also starts to exhibit behavior similar to those described by Hecro. The trackpad cursor feels frozen, or else it jumps around, often trying to stay away from or jump over any hyperlink in either text or graphic form on the page I am viewing.
I find that if I pick up the trackpad and hold it above my palm between my thumb on one side and my fingers on the other side — so there is no pressure on the clicking feet on the bottom of the trackpad — a "jumping" trackpad instantly becomes a "stable" trackpad. Put it back down on a surface and it starts jumping again.
Also, when it starts jumping or skipping, I also find that if I use one finger and bear down hard on the trackpad, it resumes being responsive.
I am filing a comment about this on Apple's feedback forum at www.apple.com/feedback at the advice of a Genius at the Apple Store at Cambridgeside in Cambridge, Massachusetts USA.

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PowerBook 12 wrote:
I'm guessing it might be a defective video card (transistors blown?).
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The current plan is to move the iTunes library to the Seagate along with the new, and ever growing Aperture library (currently on the MB)...
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