I'm having the same problem. Sometimes I'm able to watch HD videos in full, but then it drops the connection - whether it's encrypted or not. I'm also on a 2010 MBP and my Ipod has the same problem.
I've tried turning off 4G and running only 3G and I don't have this problem (though no HD videos obviously) but this is pointless as my WiFi will be quicker than that.
I've tried turning off 4G and running only 3G and I don't have this problem (though no HD videos obviously) but this is pointless as my WiFi will be quicker than that.