Ever since upgrading to iTunes 11 streaming music to my Airport Express has been totally unreliable. Before upgrading it was fine but now when streaming music from my MBP it keeps cutting out every 4 or 5 minutes for about 10 seconds. Then it comes back on and continues playing. It's really frustrating. Often after about the 5th or 6th cut out it won't even come back on. When streaming from my iPhone to the Airport Express it never cuts out and is 100% reliable all the time. I've tried a different router but it made no difference. Has anybody else had problems?