If apps like Facebook and Facebook Messenger were installed or moved to your SD card, app may crash and cause Google Play unable to update your apps. Here are some tips you could try:
- Uninstall the app/s.
- If you have an SD card installed, take it out safely.
- Clear data for apps in Google Play and Downloads using your Apps drawer.
- Re-install the app/s in your internal storage.
- Re-activate the apps to check if there's any improvement.
If you're also trying to move your Skype to your SD card, the app may reboot your device during charging. Try to re-install the app in your internal storage.