Decent60

Question on that though: Do you save the world first (with them logged in) or do they logout and then you save? I don't have it on Xbox so I'm not sure if the manual save feature is there as well (I mean, it should be but you never know).

TDR is the Timeout, Detection, and Recovery component in Windows. What happens is the Graphics Display driver for the installed graphics card stops responding. The most common reason for this issue is that the graphics device is being overloaded or used beyond its capabilities. This happens most often when playing graphic intensive games, but can happen with any process that uses a large amount of graphic resources, such as when editing or creating videos. Try uninstalling/reinstalling the driver as that fixes most graphic card issues.