Controller Lag

[MyLegGuy]

So, I'm using a wireless controller with Bluetooth to play a game and I get some controller lag. However, for the first 10 seconds or so there is no lag. Then the lag kicks in. If I go to the android home screen thing then back into the app then the lag is gone for another 10 seconds or so. It's really big lag. If it matters, I'm using a ps4 controller. I connected it using a method I found on a Youtube video. I would post a link, but I can't for some reason. So the video is called "Wirelessly connect ps4 controller to android phone" and made by a guy who seems to not own a tripod.

I'm on a Nexus 7, Android version 5.0.2 I think.

So, anything I can do?