I have a 2011 MacBook Pro and am running OSX 10.7. If I close the lid on my mac and it goes to sleep as planned I have an issue on lifting the lid. If I now try to stream video it stutters, I have tried Firefox, Chrome and Safari as well as a number of different streaming sites such as youtube and BBC iplayer and they all do the same. The only remedy i can find is to shut down the OS and do a restart when the streaming video works perfectly until I close the lid again. Any ideas what the cause may be and what the solution is to this annoying issue?