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Almost anything that is writing to your HDD could cause the defrag program to start over again. Avast! needs to create a backup set of files on your system called VRDB. This could be what is causing your defrag to stop and start . It only creates a VRDB once every three weeks.
Double clicking the blue icon ball in the system tray will show what providers are installed and running on your machine. Right clicking on the blue ball will give you a menu. Selecting Start Avast! Antivirus will bring up the scanner skin and controls for the scanner. Right clicking on the scanner skin will bring up the program menu system.