On my Nvidia Sheild, over the last 6 weeks or so, we're seeing frequent lockups with live tv (or slightly behind in the buffer). The program will just get stuck and then progress indicator will max out all the way off the right edge of the screen.
I've tried to get a picture of it, but the app crashes before I can do so.
This has happened 8-10 times to me and my wife confirms it is happening to her also other times.
This has never happened until the last 4-6 weeks or so.
I also saw this exact same scenario happen on my Mi Box (which I watch infrequently).