You need to monitor the file system shield and see just what it is scanning as it doesn't just do it of its own accord.
If no activity on the FSS then check the other shields as it is used for all shields. If you had any background p2p activity, etc. then it should be rotating.
Thanks David. This began immediately after update, and there is definitely FS activity when the issue ocurs but it isn't anything I have initiated. I know scanning is happening (I can see files being scanned in FS) but it hasn't been initiated by me.
Seems to subside upon reboot, but then can reappear.

I need to monitor more closely before saying anything more.
