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I don't think OP is suggesting he is leaving audio sessions open while putting his mac to sleep. I use the Eleven Rack as my primary interface and experience the same issue on Mac OS X Sierra 10.12.6. The Eleven Rack will only connect to a Mac if you restart and wait to connect until start up is complete - on a good day.

I just spent the last 20 minutes restarting my computer over and over. I tried every USB port, with and without a USB hub, even tried different USB cables. Finally connected after the 5th attempt. Super frustrating.

The problem is not the Mac user for using their computer as intended. The problem is Avid for not figuring out a basic user case.