My Youtube is working just fine and I have used it a few times with no problems so far. Out of the last 3 SYS(21028,21038, and 21042) the 21042 has been pretty stable and fast for me.
*Edit - Spoke to soon
.... I just play a video and it worked but then I couldnt get out and when I tired to open the app again it wouldn't open. I did a soft reset and its working again