Playback glitch when touch trackpad

Hi
I post here as it may help diagnose what I think to be a system or hardware issue.
Have logic 7.2 on macbook pro,have external sound card usb.
When playing multitracks back allgood, then I touch the track pad and a static glitch occurs in the playback.
Any ideas on how to further diagnose this major issue?
Thanks

Also,
Just had the macbook pro sent in to apple where they replaced MLB and Battery. Had the shutdown problem.
This problem is a recent one since the replacement.
Cheers

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