Remove tick where it says “Allow the computer to turn off device”.It should look something like the selected one in the pictures below. Double click the Dell Wireless WLAN Card.On Device Manager click the plus + sign next to Network Adapters. (If you are prompted to continue by the User Account Control, click Continue).Open device manager (My Computer> right click> Properties> then deveice manager on the top left side, alternatively press windows key and search for “Device Manager”.Select Maximum performance for: On battery and on plugged in.Click the + sign to reveal more settings.You can search for control panel or alternatively typing “control panel” after pressing windows key+R. To prevent this from happening follow these steps It will also turn off the wifi card and this will leave you disconnected. To reduce power consumption windows will sometimes turn off some devices which are not being used at the moment. To solve this do the following: Windows Power Saving Sometimes the adapter even disappears from device managers as if it doesn’t exist. I have also seen the same problem on other Dell inspiron and XPS laptops. Just when i was in the middle of something very important it just disconnects
