IMac Retina shuts off USB ports when sleeping

I have a new iMac Retina i7 with 32GB RAM running Yosemite. Approximately 60% percent of the time, when the iMac goes to sleep, it shuts off all of the USB ports. This includes dumping hard drives without properly ejecting them, as well as shutting off powered USB hubs. Switching the drives and hubs around to different ports does not help the problem, and it appears to be becoming more frequent. Any suggestions would be welcome.

I too am having hub issues with my 5K iMac. I purchased an Amazon Basics hub, that never worked at all. I returned it and got one made by vantec. I have two external hard drives connected to it, and they always are recognized after sleep or restart. But other things get dropped, like my two printers. I seem to be able to resolve the dropped hub ports by ejecting my external hard drives and then unplugging the power to the hub, then reconnecting the power. When i do, all the indicator lights come on again, and things work.
I am working with Vantec about this issue, they have been terrific by email, and they are offering to replace the hub. But now I am wondering if something more basic is wrong, like this SMC reset that has been mentioned in this thread. I was about to ask if that was hard to do, but I just looked at the link provided by Ralph, and doing it is easy-peasy. I will give this a try, and try to remember to report back.
thanks, Peter

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I need that, when the system restarts (a simple software restart, not a complete reboot), the device is restarted with a power-off/power-on.
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Hello @XJF,
I understand that you are not getting any signal from your HP ENVY 700-060 Desktop PC. The issue you are describing appears to be a physical issue. Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html.
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Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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IMac Retina shuts off USB ports when sleeping

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