Audio cuts out when using Interfaces

Just recently bought my first iMac, with plans to use it for multi-track recording. The audio is cutting out when using FireWire or USB interfaces to record and/or play audio. For instance, with an Edirol FA-66, even iTunes experiences brief periodic audio loss (every 20 seconds or so) when playing through the device. PreSonus Firebox works a bit better, with a 1 to 3 second loss every 40 seconds or so... this happens when using OSX as well as XP... the operating system doesn't seem to influence the problem. To be certain it wasn't a FireWire issue, I tested it with an M-Audio USB interface and had the same audio loss.
Talking with tech support, the first guy just blamed everything on the 3rd party devices. That drove me CRAZY. Finally he got a specialist on the phone, who blamed it on the intel chip.
Right now I'm just living with it... trying to record songs in smaller pieces. I wait for the audio to drop, then as soon as it comes back I hit record. I've got about 40 seconds (using the Firebox) which is enough to lay down a verse or chorus.
I'm just hoping, HOPING that someone at Apple is looking into these things.

Hello,
This may be a stretch but your mention of " hard drive hanging" prompted me to suggest your problem may involve low data transfer rates. (I mean, the hard drive may have too slow.)
When, for example, Final Cut Express or Pro are being used, they require high data transfer rates to avoid frame dropping. Apple's article on the HD requirements for those apps is here:
<http://docs.info.apple.com/article.html?artnum=58636>
eMac/ 1 Ghz / combo, 120 GB Mercury FiWi extnl Mac OS X (10.3.9)

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HTH
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Audio cuts out when using Interfaces

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