Users of 5800 series cards will be glad to know that ATI has released a hotfix for intermittent grey screen and vertical line corruptions that randomly appear while watching movies, playing games or when the computer is sitting idle.
The hotfix applies to Windows 7 32bit, Windows 7 64bit, Windows Vista 32bit, Windows Vista 64bit, Windows XP, Windows XP x64 and Windows XP Media Center.
Click here to download the hotfix.
As of yet there is no word as to why some owners of 5700 series cards are seeing the same problem.
UPDATE: ATI has said hotfix applies to both the 5800 series and the 5700 series.
UPDATE2: ATI now says they're still working on a hotfix for the 5700 series cards. The hotfix released yesterday applies only to the 5800 cards. They're still working on a fix for the 5700 series.