Intermittent Keyboard Failure on Waking, Mac Pro 5,1

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so after pretty catastrophic failure of yosemite upgrade (that resulted in salting earth , starting scratch), i've noticed strange new behavior.

occasionally, when waking computer sleep , attempting log in, external usb keyboard (a das keyboard 4) won't work. there's no input in password area, etc. external usb mouse works fine, , upon unplugging keyboard , plugging in, keyboard works again. there's no obvious failings of keyboard, , i've tried several usb ports in case problem, resetting smc.

ideas what's going on?
 



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