Mac Mini disconnects USB2 hard drives when in stop

Hi,
I am having a problem with my mac mini Core Duo 1.66.
I have some hard disks connected.
The firewire works just fine, while the usb2 raid0 stripe is disconnected every time the mac mini goes to into sleep mode.
So the mini goes into sleep mode. Then I wake the mini from sleep and the drives are disconnected (Device removal info window appears).
Also the reliability of usb2 is not at pair as the ppc machine I've had in the past ...
This is very annoying, since all the links in the finder bar are lost ..
It was doing it with 10.4.6 and now 10.4.7 too.
But suddenly this problem started with 10.4.6. It wasn't always present.
The drives uses Oxfor 912 chipset, also they've been working great on any previous mac since 2 years ..
Any idea how to solve it?

Connect the drives to a USB Hub?
It happens that the mouse and keyboard no longer work.
It happens that I have to unplug them and then to unplug and re-plug the keyboard and mouse to make them work again.
One of the drive is not showing in the disk utility (The usb2 is a software raid0)
It used to work in USB2, and then it progressively went worst and worst and now it no longer works.
But it works perfect in firewire. But the performance drops in firewire to 25-22Mb/s
Also USB2 memories sometimes are unplugged, disappear from the desktop.
I have a sandisk memory, not just the cheapest.
Maybe I bring the mini to apple.

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Mac Mini disconnects USB2 hard drives when in stop

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