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I was having the same problem and that fixed it. Thanks! Wish I had seen your post before going through a factory reset and setting my phone back up only to have the same problem. ☺ I had deactivated touchless control in favor of the new OK Google option in Google now to be consistent with my Nexus 7. It's the option to listen for OK Google from any screen that causes the problem.OK, saw this on Motorola' forums.
https://forums.motorola.com/posts/6f69380235
Open the Google app. Scroll all the way to the bottom and hit the three dot menu control bottom right, then settings. Go to voice, then OK Google detection. Turn it off.
See if that fixes the problem.