OK, so is anyone else having this problem. Sometimes when my rMBP wakes from sleep it will be on the grey crash screen and restart. Sometimes it will restart and everything will be locked up and say not responding, so I have to hard reboot, and sometimes I will sign back in from screen saver and it will just go back to the screen saver with no login screen anymore. For that I can cmd+opt+pwr sleep and then wake from sleep and it comes back. But all of these stasis problems are annoying me to death. Does anyone know a solution to these problems??