I watched a film on Netflix with the 13'' MBA 2012 running on batteries. After about 30 minutes the video did not continue but the sound did and there was no way to close Safari or anything else for that matter. I had to press the power button to restart and this happened twice. Is this a Safari and/or Safari-Silverlight issue and is there a way to fix it? I am using the newest Silverlight version. I guess I could try if it works better with Chrome or Firefox.