G3 keyboard help topic

Ok, so I got android 5 last month and since then, even now as I'm typing this, the built in keyboard has been lagging when typing, I have to restart my phone in order for it not to, then after a few hours it starts lagging again, its horrible, types everything i press probably 3 or so seconds later, and i like the keyboard, so i dont want to change it. Any help would be appreciated, oh and I'm running 20f android 5