I've noticed that every minute or so, the wifi on my 15" MacbookPro Retina just doesn't seem to work, yet the icon displays full bars (4/4). In the exact same location my iPhone shows 2/3 or 3/3 bars and the wifi works excellent. What is wrong with my MacBook Pro? How do I resolve this? Shouldn't the MacBook get better reception as it has a larger and more powerful antenna?