Keyboard/USB connection problem.

Couple of weeks ago my aluminum keyboard intermittently stopped responding to my touch. I unplugged/replugged into a different USB port on my Mini which seemed to fix it a couple of times, then shut down computer and restarted a couple of times which worked for a bit, than i started getting this message:
A USB device is currently drawing too much power. The hub it is attached to will be deactivated.
I started using my old keyboard and everything was fine until today when it stopped responding. Doing the same things as last time but haven't gotten the warning message, YET.

Sorry--keyboard went out again before I finished previous post. Somewhere it was suggested that I get a USB hub which runs on a separate power supply. Before I attempt that remedy, any comments, suggestions?

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