How do I fix my google u.i from Crashing ?

[AC Question]

I have a moto G3rd gen. It currently runs Android Marshmallow. Just randomly today, I get a notification that says " unfortunately google "somthing" has crashed. After this happened. My notification bar at the top can't be scrolled down, and The little O(exit button) on my phone is unresponsive. Can somebody please tell me how to fix this ? I already restarted my phone, and it still didn't fix it. Thank you !