From the Snapdragon Battery Guru description in the Google Play Store:
Q. Why is my Wi-Fi ON sometimes, when I?m expecting it to be OFF?
A. Snapdragon BatteryGuru?s Wi-Fi management feature turns Wi-Fi on when you need it and turns it off when you don?t, thereby saving you power. However, even when you don?t have Wi-Fi access Snapdragon BatteryGuru will periodically turn Wi-Fi on for few minutes to check if your ability to access Wi-Fi has changed. Likewise when you move to a new location, BatteryGuru will turn Wi-Fi on for a few minutes to check if Wi-Fi access is available. Fear not, turning on the Wi-Fi radio for a few minutes like this has little or no impact on your battery life.