Though I'm having this problem with my S4, I've had it with my Bionic as well. Youtube will not play on a 3G connection. Though I usually have excellent 4G coverage, on the train to and from work it usually gets lost and I only have 3g. While watching a youtube video, the second it kicks into 3g the video freezes and continually tries to load. this also happens when I'm tethering to my nexus 7. the second the connection drops to 3g youtube dies. WTF? I know this is a bigger issue as I've found people with the same problem on at&t, sprint, & verizon. the only common settings in the phones are android and the youtube app. so it must be something with the app. but what? any work arounds?