IMacs randomly not recognizing keyboards.

iMac 21.5", Early 2013 Models
I've got a problem with several iMacs that are refusing to recognize their USB keyboards. Come in the next morning and you'll get an error message on the login screen that there is no keyboard detected. No devices are associated with Bluetooth, and Bluetooth is infact turned off. The keyboards are unresponsive, and the LEDs on the mice do not light up. Now the mice are plugged into the keyboards when this happens, but if I plug the mouse into a USB slot on the back of the iMac it works just fine, including the same one that the keyboard was plugged into.
If I swap keyboards with another iMac that isn't having the problem the keyboards will suddenly work on both machines. It's only if I reset the SMC and clear the NVRAM can I *sometimes* get the keyboards to respond. I've replaced the keyboards with brand new replacements, and the issue randomly persists on the same machines. MRI isn't detecting any issues, nor has ASD EFI & OS. The occurance of this issue is totally random.
Any Ideas?

Bump.
Still having this issue.

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IMacs randomly not recognizing keyboards.

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