HELP! SL1 CRT memory collating error 6782????

Hi, I just started getting this error. The machine stops and screen goes blank except for the message "CRT MEMORY COLLATING ERROR 6782". I can't do anything but shut down the machine and reboot. It began as a rare thing a few weeks ago. I would just turn off, turn back on and keep going the rest of the day. Today it got much worse to the point i could barely run the machine for 5 minutes before it'd lock up.

Any ideas?

Thanks