If an app of functionality does not behave well, the first step is to delete your app preferences. 

To delete your app preferences:

1. Open the pull-down menu using two fingers and tap on the settings icon (cogwheel)
2. Scroll down and tap on Apps
3. Next, tap the three vertical dots on the top right corner and tap Reset app preferences, then Reset apps.

When this does not improve your issues:

• Check your SIM card
• Use Safe mode
• Use the troubleshooter
• Return to factory settings.