bad crackle and noise when recording with Mbox

[blameus_product]

I just bought an Mbox (im running PT 6.4) with a 2.4 ghz P4, with 512mb of ddr2700 ram.

Everything seems to be running fine except my mic line starts to crackle and pop after a minute of recording. I adjusted my h/w buffer and it made it go a little longer before that started. Using the line/playback knob i determined that it's not the line in. The problem is somewhere after that. I stopped pro tools and restarted my computer and it worked fine again until about a minute of recording. I can close the session and load another and it will be fine until recording.

Anyone had this problem before?