Have been using my Nexus happily for over a year, but suddenly having problems. When I go to open facebook, the blue screen comes up, but after a short thinking time it just closes. Have uninstalled and reinstalled the app with no improvement. Also, starting at the same time there is the issue that message keep coming up that youtube 'has stopped' as well as linkedin (even when not doing anything related to these apps). Yes, I have rebooted, but it hasn't helped.

Emails and other apps work fine.

Can anyone help?  thanks Cathy