I've noticed the sluggish response gets worse overtime on the ps4. I use the same keyboard upstairs on my pc and it works fine (it's just a crappy HP thing) but on my ps4 it'll start off just missing out the odd letter..then it gets to the point where it'll be like I'm just mashing the keyboard. All I've tried is making sure the controller and my phone are out the way so they don't interfere, but other than that, just had to put up with it