NIS 2012 Asking for RESTART at least once a week now!

Hello,

 

I am curious, why does norton ask me every over week to restart?

 

I have NIS 2012 windows 7 Professional.

 

I am getting a message saying something about I need to restart to get the latest updates?  and I can check what time I want to restart, up to 24 hours from now? I still have 311 days left on my subscription?

 

 I love norton its protected me from alot, but why ask for restarts so much?