Recently some users have been having an issue with the Battlelog update 'disappearing' from the installed programs.
This will cause the error message "You were disconnected from EA Online'.
If you've received this error, please go to the Windows Control Panel.
Go to Programs & Features.
Find Battlelog Plugin 1.122 and highlight this program.
At the top of the Installed Programs list, please select Uninstall.
If this specific issue has affected you, you will be alerted "This program is not currently installed. Would you like to remove it from the list?" Select Yes and download the attachment of this post to re-install the Batltlelog plugin.