Sleep goes into shutdown when USB hub attached

I was having no issues with 'sleep' until I added a USB (powered) hub. After that, sometime during sleep mode (not immediately) my iMac goes from sleep to shutdown.
If I unplug the hub, sleep works properly.
A slight inconvenience, considering that I bought the hub to avoid reaching around the back of the iMac anytime I needed to plug in a temp peripheral (iTouch, thumb drive, etc.) Though, I can just unplug the USB cable from the hub and not the iMac and sleep mode still behaves.
I've seen posts where USB peripherals can cause an iMac not to sleep, but I seem to have the opposite issue.
Has anyone run into this? I don't know if it is the hub in general, or if a powered hub is an issue.
Thanks for any feedback.

Hi, well you could try the much vaunted SMC & PRAM resets...unmount all EHD first.
Why not try the hub in another computer........L

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Hi @Andrew_c51 ,
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