My MBPr buffers a lot and drops in quality on youtube videos. It use to run flawlessly and Im not sure why it no longer does. Speeds test show around 40 megs. I have the same Airport Extreme that Ive always been using. My everything is up to date. Im not far away from the router. Ive reset the router. This is very annoying. Is anyone else having this issue? Any suggestions for a fix? Thank you.