Various 4G / 5G stability problems and now my iPod is USB 1.1 only!

Hi,
I bought a brand new iPod a week or two ago and it worked fine for one sync. Then the battery was running low (because I'd been using it!) so I plugged it in and iTunes synced automatically and the battery charged. after the sync I hit "eject" in iTunes so that the battery would just charge.
I returned to find that the iPod was still mounted! Very strange. I ejected again..... and it seems that what was happening was when the iPod was ejected it simply rebooted and when it came back up was mounted automatically again!
I ejected and unplugged the iPod and it was no longer stable - I would get to the menu and almost to play a song and it would reset. It seemed like my speed was the limiting factor (i.e. the iPod would only stay up for n seconds), rather than it crashing because I tried a particular function.
I saw this unstable behaviour with my old iPod (4G, firewire on this same machine) too where I had to reflash it to get it working again reliably.
So, I reflash the (new) device with the iPod Updater software downloaded for me by Software Update. It resets, and all seems well, with the rather catastrophic exception that now the iPod is only recognised as a USB 1.1 device according to System Profiler! The transfer speed is very very slow.
This is really a bit of a showstopper for my user experience. I have tried:
- Resetting my computer
- Changing the cable (I have two USB2.0 cables and 1 USB2.0/Firewire cable which I have tried all of)
- Changing USB ports (including taking ALL my USB devices away and plugging the iPod directly into the back of the desktop machine)
- Reflashing the iPod again
I have NOT tried:
- re-downloading the iPod Updater from Apple and using that (I'm downloading it now)
So.... the questions are:
- Has the firmware updater somehow made my iPod appear to be a USB1.1 device?
- Or is this a hardware fault and I need to return the iPod to be fixed?
- Is this stability problem a commonly observed one?
- If so what can I do to avoid it?
Thanks in advance,
Neil.
Powermac G4 MDD   Mac OS X (10.4.7)  

Cannot reproduce presumed fixed

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