norton security periodically disabled with message "subscription unavailable"

Norton security periodically decides that my subscription is unavailable and disables security. This has happened more than once and is happening right now, leaving my machine unprotected. Or not. Who knows? I would appreciate a solution to this problem (which is clearly Norton's) that doesn't involve me having to uninstall and then reinstall the entire package. I am running latest version of Yosemite and latest Norton on an iMac.