USB2 Card becomes unresponsive

Has anyone else run into this problem? I have a USB2 PCI card in my G4, and any devices plugged into it (mainly my iPod Shuffle) become unresponsive after a few minutes. For instance, I will be copying songs to my iPod, and halfway through, the copying process will drag to a halt. Burning CDs to a USB2 CD-RW often fail because the burn cannot complete. I have tried two different brands of USB2 cards with the same result. Any suggestions?

Hi-
Can you tell us the maker(s) of the card? More important than the compatibility listing is the chipset. Many cards that don't list Mac, or list PC/Mac are fine. Mac specific cards often feature nothing different from other, cheaper cards.
I'm also wondering if your machine is experiencing power problems on the USB or PCI bus. Using a self-powered USB hub in between the USB card and the connected devices may help.

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