Without warning, and with no predictable timing or situation, the game with freeze, then drop to the desktop. A warning will appear with a message saying that a TDR has occured, then another that the graphics driver crashed and was successfully restored. This will occur a second time. Then two popup boxes appear stating that Java has crashed and the program needs to close. This has happened while flying around, while building, just after teleporting sectors, after using the transporter, and while doing nothing. I cannot figure out what is causing it or what might be triggering it.