"Disk Not Ejected Properly" error after EL Capitan goes to sleep and wakes up again.

Hi, community.

On public launch day, I upgraded my Macs (Mid 2010 MacBook Pro 15", Mid 2012 MacBook Peo 15", Late 2011 MacBook Air and a Mid 2010 Mac Pro) to OS X El Capitan. In general terms, the upgrade process went smooth.

But, I've been presenting an annoying problem:

Each time any of my computers go to sleep, if they have an external hard drive connected to an external USB Hub (unpowered), they present a "Disk Not Ejected Properly" error after they wake up again.

I didn't have any of these issues with Lion, Mountain Lion, Mavericks nor Yosemite! Only now, when I upgraded to El Capitan, things are getting annoying.

Does any one else present the same issues and, do you have a solution to this problem.

Thanks for reading.

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