My Macbook Pro, running 10.11.6 - won't stay connected to any wifi network. It'll connect initially and then be fine for about a half an hour and then everything will just stop loading. The graphic on the menu doesn't change and doesn't indicate that it has had an troubles or disconnected - everything just stops working. Then I have to turn my WiFi completely off and restart it and reconnect to whatever network I was using before. It's a huge hassle to have to do this every half hour-ish. Does anyone know why this is happening?! It's with any wifi. At work, at home, friend's houses, etc. so it must be the computer, huh? Thanks in advance.