Idle time scan does not stop

Hi all,

I found this issue yesterday, and today it happens again, i leave my notebook for a while and when i'm back, i check the task manager, one of the Symantec Service Framework process still using a lot of system resources, it wont stop until i reboot system. I'm using NIS 18.6.0.29, Windows 7 Ultimate x64 sp1 with latest updates, i have installed this OS for a month, everything is clean install and i've ever seen this in the previous versions of NIS . Is there anyway to stop it?