ITunes skips/pauses when playing back .wav or .aiff files

Hello all,
Ever since I upgraded to iTunes 6.01, every .wav or .aiff file I play results in skipping playback. Sometimes the sound will pause, other times it will skip half a second or more. It sounds like a scratched CD without the screeching.
The iTunes visualiser goes 'flat' during these periods of silence, implying that it thinks the silences are breaks in the music. Rewinding the skipped portion usually results in it playing back satisfactorily, although it will continue to skip throughout the remainder of the track, as it would have done without my intervention.
They still skip when opening the files in QuickTime Player, although not as much - perhaps once a tune rather than the five-almost constant in iTunes. Also, they worked perfectly in both programs before I upgraded to 6.01.
Anyone else having this problem, or is it just me?
I've sent feedback to Apple, but other than that, I'm at a loss as to what to do. Any suggestions?
Thanks for your time,
Tony Ghirra
Powermac G5 Dual Processor 2.3   Mac OS X (10.4.3)   2.5 Gb RAM

I updated the AE firmware and made sure my airport and AE software were current, but the problem is still there. One thing that makes it hard to track is that the amount of skipping varies during the day, so sometimes it will play an album without skipping, and others it will skip a few times per track (i.e. unlistenable). Still fiddling with channels to see if that helps...
There is one peculiar thing that happens only with playback involving AirportExpress, even if there are no skips in the track:
When iTunes approaches within (approx) 10-15 seconds of the end of a song, it will jump the time-display forward to the beginning of the next song: then the display will wait at the 0-second mark of the new song till the current song almost finishes (it will clip a couple of seconds off the end): then iTunes will start playing the next new song.
G4 iMac   Mac OS X (10.3.9)  

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