Actually, I get this exact same issue with Netflix and version 3.2.2 so I'm not sure it has anything to do with 4.x firmware. I have found the same thing helps that you have. Start something else and then go back to the show I want to watch. I hope Netflix keeps working on their code. The buffering needs some serious work as I drop down to low quality mode fairly often, even when sitting within feet of my 802.11n router.