Robotic Digital Distortion when recording voice! Please help!

[Roboteknic]

Hello fellow Pro-Tools users.

I have recently upgraded my PC and Pro-Tools but am having problems.
The recording goes fine for a bit then suddenly the sound goes all weird and robotic!

Sounds like a digital issue of some sort but I have played with all the buffer settings ETC and the issue just wont go away.

Upon looking at the waveform, that all seems fine so I don't think it's actually recorded the sound, but on bounce down and playback the audio is playing up! Any suggestions? A compatibility issue? A setting I have missed?

I spotted this thread here:

http://duc.digidesign.com/showthread.php?t=231731

Bit this doesn't give a solution to the problem? Low Latency Monitoring is not on LE/Mbox systems?
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Windows 7 @ 16 bit

Intel Core i5 M430 2.27 GHz

4GB ram

Protools LE 8.0.4 MBOX 2 rack...

MIC WITH PHANTOM POWER (TESTED AND OK)