My USB ports get disabled on my iMac when in sleep mode

I can't seem to figure this out. When waking from sleep mode, all my USB ports are disabled. I first noticed it when the USB speakers stopped working, but none of the ports work, to the printer, or to the scanner. The only way to reactivate the ports is to do a restart. I did a virus scan of my entire HD but it found nothing. I have not installed any new software recently so I'm stumped. I'm hoping this isn't a hardware issue.

Sometimes, a computer has a problem remapping your USB devices after sleep. Disconnect all of your USB devices: printers, mice, scanners, everything. Wait a minute. Reinsert the devices. This resets your USB map.

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