My Assist has not been working right and I'm not alone. The reviews on the Assist app page in the Play Store show that there is a common problem. So far I've seen X & G owners complain. But one reviewer figured it out. The latest update for the Google app messes up Assist. Their temporary solution is to uninstall the updates for Google. I did and it works great again. Everything else I tried (battery pull, Assist uninstall and reinstall, FC, and a bunch of other stuff) didn't work. Hopefully this will help some of you out.