Firewire drives random unmount

I have 2 WD My Book external drives attached via Firewire to my 27" iMac, one is used for Time Machine backups the other is additional system storage
I had this config running under Snow Leopard on this system and my earlier 24" iMac with no issues.
Since upgrading the 27" iMac to Lion I am experiencing random unmounts of both Firewire drives with the result that  the Time Machine backups are failing and I have to physiclly reset the external drives to get them to sucessfully mount again.
Both WD drives have the latest firmware and OS X is up to date - any thoughts how to resolve this problem and keep the Firewire drives mounted at all times ??

No, never solved the problem, I still get the Firewire drives randomly unmounting and I have to power then down to get them to remount - this never happened with Snow Leopard ( or prior OS versions on my previous 24" iMac ), only started after the Lion upgrade.
Alan

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