ccsvchst pegs CPU to 100%

I am running Norton Internet Security  v17.7.0.12 on WIndows 7 32bit Home Edition. Dell Laptop XPS M1330 with 4g of memory.

About one week ago I started having ccsvchst.exe peg my CPU to 100%

I have tried turning off compressed files scan and various other things I found on the internet but nothing seems to work.

Generally I can only fix the problem by rebooting the machine.

It does not happen all the time - probably only when a scan starts?

Any thoughts?