If a widget disappeared from your home screen, then add the widget by touching & holding an empty spot on your home screen.
If an app disappeared from your home screen, the shortcut for opening the app was removed and you just need to add a shortcut.
If an app disappeared from your list of all apps, you need to reinstall it.
If the apps in your favorites tray are being replaced by apps you haven't selected and you don't want them to change, turn off app suggestions.
After each step, check to see if the issue is fixed:
Turn your phone off and then on again.
Press & hold the Power + Volume up buttons simultaneously, then tap Restart.
Contact the app’s developer.

If you experience a lag when opening an app, turn on performance settings.
If apps are disabled because you’re in safe mode, you can’t use them until you exit safe mode.
To exit safe mode, turn your phone off and then on again.
If you see apps waiting to update or stuck in “Pending” status:
Check your settings related to downloading apps:


Update the Chrome app 

After Chrome has updated, tap Update all.
Apps should now update normally.
After each step, check to see if the issue is fixed:


Go to the developer’s website for support.
