Its looking for networks because you clicked on the WiFi icon and the Mac assumes you might want to switch which network you are using, so it is trying to populate the WiFi menu with choices.
If you stop looking at the contents of the WiFi menu, the Mac is not going to bother looking for networks.
When you open the refrigerator door, is the light on? Why is the light on every time you open the refrigerator door? Is it always on? How do you know? Same principal
Message was edited by: BobHarris