Finder freezes with WD My Book Studio drive

About 14 months ago, I bought a 1TB Western Disk Digital My Book Studio external disk drive to use with Time Machine and it works fine. Two months ago, I bought a 750GB Western Digital My Book Studio disk drive to store my photos and other files. It does not work fine.
About a month ago, my PowerPC G5 with Mac OS X 10.5.2 started to freeze up inexplicably. I let it run 24x7 and just go into sleep mode when I am not using it. I frequently access this Mac via my AirPort Extreme Base Station to off-load photos to the 750GB drive from my MacBook Pro. This was working fine for about a month, then for unknown reasons, the G5's Finder just stops.
If I click on an item in the Dock, nothing happens. I ran Disk Utility and Disk Warrior against all the disk drives. All came out fine, except for some problems with the 750 WD drive, which were repaired. Yet the freezing continues. It will freeze after two or three hours of idle time.
I tried turning off Time Machine. No good. Both WD drives are connected via a powered USB hub. My printer on the same hub works fine and so does the 1TB WD drive. I tried switching USB ports. I tried a different USB cable. All those things made no difference.
Yet, if my G5 is frozen and I yank the power cable from the back of the WD 750GB drive, the warning window about improperly disconnected USB drive pops up and my Mac springs back to life. I also have Disk Warrior's disk monitoring feature installed, but it finds nothing wrong with anything. I tried looking at the console, but no errors show there that relate to this disk drive issue.
I also upgraded from 10.5.2 to 10.5.3. No difference in terms of this disk drive problem.
If anyone has any suggestions on how to fix this problem, please let me know. I tried submitting a problem report on Western Digital's web site a few minutes ago, but it hangs when I click the submit button using my MacBook Pro and Safari.

A Western Digital My Book Studio may not be the best of choices for use with a PPC Mac. Sorry to be the bearer of bad news, but see
Western Digital “My Book” drives   !!  AVOID  !!
+I frequently have URLs that I provide removed by a moderator. If that happens in this instance, the document is a "Sticky" at:+
bombich forums > "General Tips" > "Western Digital 'My Book' drives   !!  AVOID  !!"
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