Apps are losing Firewire drive

I've got a firewire drive connected to my eMac with Time Machine and EyeTV primarily accessing it. Every so often though, both these apps seem to lose the drive. The finder still sees it, I can navigate and open files, but EyeTV will lose its connection and fail to record, and Time Machine will just give errors. The only way to fix it is to eject the drive and reconnect it manually, or restart the whole mac.
Anyone else experiencing this? Is using a Time Machine volume as a normal hard drive not a good idea? Thanks for any help.

Couldn't resolve it.
Took the gear back to the shop and finally got a refund. Be careful with Prolific stuff.

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    would love any info that might help.
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    Dr. Smoke
    Author: Troubleshooting Mac® OS X
    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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