iPhone 5/5C LTE YouTube streaming via Safari

What the heck is the issue? My fiancé has the iPhone 5 and I have the 5C. We are both on Sprint LTE. ALL videos that we play on YouTube via Safari will play part ways through, but then the video and audio with cease but the "steaming ticker" will continue. In trying to restart from the beginning, the video will literally play back in FFW motion until the dead spot where once again the video and audio will stop but the ticker is still going. Anyone else with us on this one? It's so strange; and REALLY annoying.