USB port does not work properly on Tecra M3

I need help with my Tecra M3 USB problems.
It has 2 USB ports. Awhile back the USB ports refused to recognise any non-driver USB memory sticks (I do not have any driver required sticks to try).
Recently I've had to re-install my Siemens ADSL modem, driver etc. which runs via USB cable - LAN connection 2 then WAN miniport. And this is now causing a problem.
1. the Modem LED tells me that it has power (it's a non-powered modem - Siemens C100-1)
2. the link LED holds for about 10 minutes (whilst I'm online) then turns-off (although the properties of the connections tell me that they are still connected)
3. other hardware - printer etc which is powered runs through the USBs OK.
4. the modem seems to be working ok because I can use it with an iBook without problems.
Could this be a USB driver problem? How do I find out? If so how can I fix it?
Thanks

Hi
Thanks for the notes - you're probably right with your suggestions, I've only just read your reply.
In the meantime I didn't have the patience so after much blood, sweat and tears - I re-installed XP.
The support team suggestion I updated my Wireless LAN driver, which seemed a little strange because I have never used any wireless device and didn't mention I ever had a problem with it in my initial problem!!
I'm going to back to a Mac when this Tecra is outdated :)

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