I started a run activity. Halfway through my run, I looked at my charge 4 and saw this notification " GPS off cannot establish a GPS connection. Turning off GPS". I tried pressing the button so the charge 4 can go back to the home screen. But the button won't response. Tried to restart using the video as above but nothing works. The button is just unresponsive. 

 

Could you please help?

Thank you,

Wanjing