Home key error

I have the same problem. It appears to have something to do with the latest Google app update. Uninstalling the update fixed it but the problem comes back when it updates again. For now, I'be turned it off but now voice to text is gone. Here's hoping for a speedy fix.

How do you uninstall an update?  No im not  ery tech savvy lol

Go to settings, more, application manager. Scroll to find Google App and select it. Select uninstall updates.