Mac Book Pro with a separate apple keyboard (wired) randomly the keyboard will make a thudding noise like a key is depressed and then freezes

Hi I'm using a Mac Book Pro with a separate apple keyboard (wired).  Randomly the keyboard will make a thudding noise like a key is depressed and stuck (which it isn't) which then stops when the keyboard is unplugged.  I've tried rebooting, plugging it into another port and unplugging  my mouse from it and it hasn't solved the issue.  I also can't pin point when it does it, it seems to be random so sometimes, like now it's fine and then others it does it every few minutes.  I'm reluctant to throw the keyboard out if there is a chance it can be fixed.  Any ideas?

You cannot use any additional devices on the keyboard's USB ports when used in this fashion (except perhaps ONE low power Apple mouse). Anything more draws too much power and may make the keyboard malfunction. In general, keyboards do not tend to complain about low power, they just stop working properly.

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