USB keyboard loses power for a while then come back in 24 or 48 hours??

I have 3 new late 2013 model imacs  
I have for the 3 computers apple "USB" keyboard because the keypad
for some reason some times the computer freeze and the keyboard stop working so after doing a hard reset the keyboard won't work anymore I have to use a wireless keyboard for a day or two then the keyboard will work again, first I tought that my keyboard was defective, but same problem happened with the other 2 computers.  I wonder if someone else had this problem
Please advice, for a solution
Thank you very much
joseluis

I keep seeing people ask and the advice to replace if it has been unplugged, but really have nothing to confirm that from my experiences.
My experience is that a weak or dead battery can cause much more than date and time issues.
I have seen it time and time again.
Deal with used machines and you will quickly learn....
I'll give no "recipe" or set list of symptoms, but the range of irregularities that can occur make it a quick and easy first line of troubleshooting, especially when the machine has been off the mains for a few months.
Why fight mysterious maladies and troubleshoot with the knowledge that the PRAM battery is beyond it's useful life.
Maybe they recharge?
Not likely. They are chemically nasty, disposable, one way discharge batteries.
They aren't Lithium-ion batteries

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