Its been lagging really badly at times with my new 15" mbp. It worked perfectly fine with my 13". Like when I'm going thru my feeds pressing 'j' to go down, it'll randomly press it like 15 times and skip through a bunch of them. Then it'll just stopped typing and 2 seconds later it'll catch up. Sometimes it even says the keyboard is disconnected, then a couples seconds later it'll say it is connected again. Is something wrong with my new mbp?