Ubuntu :: Blank Screen And Xorg - Compiz Effects Quit Working

I have a problem with Xorg, I am not sure if the black screen is related, but sometimes when I am just using the computer, with heavy processor and memory, but sometimes not, but the title bars to the programs disappear, my compiz effects quit working, and the cairo dock becomes unusable, so I cannot switch windows, but I can close them using 'File > Close" to access the windows under the ones on top, and to fix it I have to switch over to a terminal "Ctrl + Alt + F2" and log into that to kill Xorg by "sudo top" and killing it with the PID.

And the Blanking Screen, I am just doing usual programming with Bluefish, Eclipse and the terminal, and the screen will just go black, and won't come on if I wiggle the mouse, press a key on the keyboard or turn it off and back on, the status light on the monitor stays green, and doesn't go to orange as if it were unplugged or the computer went idle, so I know that it is still communicating with the monitor, but the way I fix this is I have to manually power down the machine via the power button and turn it back on and it works normally for a while.