After owning a Nexus 7 for at least 6 months, I finally decided to get to the root of this issue. Due to past experiences I knew it had nothing to do with anything to do with the network... router, wifi connection, etc. It also had nothing to do with the Wifi optimization setting. And uninstalling the YouTube updates, clearing cache/data, etc etc did not help at all. Today someone emailed me a link to a YouTube video... and when I play the video in YouTube, it stops at the same spot EVERY time - 1:08. This doesn't surprise me, however, as I'm not sure if I've ever seen a full YouTube video on the device. It always crashes after about a minute or so into the video. So instead I let another app run the video, namely BSPlayer Free. It plays the entire video no problem. Twice. One more time, I load it up again in the YouTube app... crashes, 1:08. So, it's just something jacked with the YouTube app, which is ironic... for a couple reasons. Anyways, hope that helps someone.