AirTunes Stream Re-caching or Dying

Hi, I've got a 15" MacBook Pro (2.16 GHz Intel Core 2 Duo) w/ 2GB RAM running OSX 10.4.10.
I'm streaming music to my home stereo via an Airport Express w/FWv6.3 which was working fine until around the time I upgraded OSX from 10.4.9 to 10.4.10. Everything else has remained unchanged.
Now the stream seems like it's constantly re-caching about every 10-30 seconds and playback on iTunes (v7.3.1) is jerky.
The seconds counter and playback will stop for a pause of 3-5 seconds and then restart for a few seconds and then stop for 10-30 seconds and then play again for another 30 seconds, etc.
Many times playback will just halt altogether. When I click play I'll get the "reconnecting" status and then playback may or may not start.
During these pauses my signal strength is fine, but I also notice that internet connectivity stops or drags too.
It's as if there's a network disruption despite that fact that signal strength is fine. This happens even if the PC is right next to the Airport Express.
Any Ideas?
Mac OS X (10.4.10)
15" MacBook Pro Mac OS X (10.4.10) iTunes v7.3.1, Airport Express fw v6.3
Mac OS X (10.4.10)

I am definitely convinced that there was something in 10.4.10 (and probably the iTunes upgrade specifically) that screwed things up - because nothing else changed. I was getting ready to do some serious b1tching, but I seemed to have fixed it. Here's the changes I made (after 100 hard resets and reconfigs
In the AirPort Admin Utility:
1.) Under the AirPort Tab
1.1.) Multicast rate is set to 1
1.2.) Interface robustness is on
1.3.) Channel is set to "2" (basically I changed the channel)
1.4.) Mode is set to "g only" (if you have 802.11g of course)
2.) Under the music tab:
2.1) Enable AirTunes on this basestation is "on"
2.2) Enable AirTunes over the Ethernet port is "on"
2.3) iTunes Speaker Name is set to "Living Room"
My AirTunes set up is that the AirPort Express is plugged in to an ethernet cable that runs directly to my wireless router and then there's an RCA cord which is plugged into my stereo of course.
I'm thinking that it's either the "living room" setting or the ethernet setting that changed things. I think the new iTunes software is where the problem came in and that maybe you have to name the speakers.
Good Luck! If you get it fixed, please post what your working config is in case my theory is crap. Thanks!
Mac OS X (10.4.10)
Mac OS X (10.4.10)
Mac OS X (10.4.10)

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