You can't uninstall but you can uninstall updates and then have it re-update from the play store.
It may be the Google search OK Google detection in all apps blocking use of the microphone. So, go into the Google app. Scroll to the bottom, tap the three dot menu control on the bottom right, tap settings, voice, OK Google detection, and turn off all of the items that might be on. It's possible that will fix it without uninstalling the update, etc.
I agree with Doogald, regarding turning off the Google Voice commands, except I seem to be able to leave the one about "OK Google Now on Google Search" checked. Otherwise, I get no response if the other two options are checked...it just keeps waiting for a command, even though I am speaking.
Also, I find automobile background sound (road, radio or A/C fan noise) will cause voice reading problems.
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