Up until the most recent system update, when driving, if I wanted to make a call, all I had to do was press the headphone's mic button for a little over a second and the Google search voice would speak up and say: "Speak now!" after which a beep would sound and I would say "Call..." and the name of the contact. Then, if there where options, it would ask which phone to call. Now when I press that button nothing happens, and if I unlock the phone, it's not active, so it means it's not opening. If I press the button in the same way with my phone unlocked, the search option opens, but it doesn't say "Speak now!" either... Where can I reset it to work the way it was working before?