Norton subscription set to 0 days?

Something strange on my N360...after getting in a lot of SPAM, I checked the Norton icon in my system tray, and it had a red X in the corner!  I pulled up Norton, and everything was marked as RED and not working.  I clicked on my Account info, and it showed that I had 0 days remaining in my N360 subscription!

This has happened before...I just rebooted, and now that same Account info shows that I still have 126 days remaining.

Anyone know what could cause my N360 to think my subscription had run out?  Is there something malicious hiding somewhere that manages to fool Norton?