FireWire iBook 320GB Drive dismounts after iMac wakes from sleep

I've got a 320GB MyBook external combo (USB 2.0 & FireWire 400) hard drive from Western Digital. Sporatically, when my iMac has been in sleep mode for a while and I wake it up, the hard drive suddenly dismounts and is not visible from both the system profiler and from the Disk Utility program. I get the message that the disk was not put away properly.
If I unplug the cable from the drive port and plug it back in, the drive remains unmounted, but if I unplug the cable from the iMac and plug it back in, the drive re-mounts and is accessible from the desktop again.
Aside from being annoying, I can't be confident that my computer will re-mount the drive during my regulary scheduled backup, nor can I be confident that I'm not damaging the drive every time this happens.
Any ideas why this might be happening? Is there any firmware I need? I have a brand new 20" iMac (less than a week out of the box) with an upgraded processor (233 GHz) and video memory (256MB).
iMac 20" Core 2 Duo 2.33 GHz   Mac OS X (10.4.8)  

Ive got the same problem with a Western Digital 500GB My Book Pro on my iMac Ive tried it on a few other machines and I think its happened on them, I say think because it was only when it had happened a couple of time that I started to take notice of circumstances etc and ive only had the drive a week, downloaded what may be a more uptodate "My Button manager" from the WD site still happened but Ive got this idea that it didnt happen on one machine which may not have had the MyButton thing on at that time, have you solved it yet I am using USB at the moment.
20" iMac 2.13Ghz   Mac OS X (10.4.8)  

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