Audio pitch / playback speed issue, MacBook Pro 10.4.10

I experienced a very strange audio pitch and speed issue that affected a recording I was making in Ableton Live 6.0.3.
Setup is MacBook Pro 2.16GHz, Mackie Onyx Satellite FW interface for audio, recording straight to internal HD.
I made two multitrack recordings (3-4 tracks each) which played back fine initially within Live. I then rendered the audio to AIFF in order to burn data and audio CDs.
Testing the playback in iTunes, the audio was strangely pitched lower than what we originally recorded. Checking other tracks from my iTunes library, they were playing back FASTER or higher-pitched than normal, and so did audio streamed from MySpace that I was familiar with.
CDs burnt from these AIFFs exhibited the same "lower pitch" / slower playback.
Reopening the Live Set, they were now also playing back lower pitched than what we had heard just minutes beforehand during the recording / mixing.
After I let the computer sleep for a few hours, I came back and checked -- system and internet audio was now playing back at normal speed, but the Live Set was still lower-pitched - the individual WAV files in the set were all pitched lower.
The Live recording prefs were stock standard - set to record 24 bit WAV at 44.1Khz. Since the issue seemed to affect non-Live audio as well, I'm guessing it was something more at the CoreAudio level?
I managed to salvage the session by taking the exported AIFFs into Tracktion 3 and using the pitch change function in the Clip Properties pane. One track was 1.5x off, the other was 1.125x off.
I'm at a complete loss as to why this would happen. It's a first (and hopefully only) occurrence. Has anyone had this happen to them? Could this be some sort of intermittent hardware (clock) glitch? Something to do with 6.0.3 and OS 10.4.10?
I do need to take this MacBook Pro in for servicing - it experienced the "bulging battery" issue and has a partially dead keyboard (the keys near the upper right) - but even with those issues I've not had audio issues like this.

In any case, if my Mac had problems, I'd send it in for service....!!!
About your problem, I don't think that it depends on hardware.
I'd check Live configuration and the SR of the audio files: you know, Live has so many features to modify speed and a lot of other parameters that bacomes easy to forget something.
Try recording something with Garage Band so you will be sure if there is a real problem.
cheers
rob

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