Go 4 is a very resource hungry program, I've got a Acer tablet that I was using to fly my Phantom 4, after a while I was getting a message telling me it couldn't connect, I can't remember the exact words used but I checked everything then kicked myself (being an engineer) formatted my tablet and loaded Go 4 again and it worked perfectly.
Not thinking I'd used my tablet as another computer, uploading Facebook, Messenger, movies, music and all sorts of rubbish. A lot of these run in the background so, once I'd reloaded Go 4 I stopped or deleted every program that was already installed and I didn't use and now keep my tablet exclusively for my Phantom 4