It was some time after I tried Catalyst 10.6 that started having issues, and reverting to other drivers didn't seem to help.
Problems included random lock-ups, driver stopping and recovering, couldn't even uninstall the drivers after some point.
Found the following link in relation to drivers not uninstalling, and so far my machine has seemed stable for a few days on 10.6.
link is http://code.msdn.microsoft.com/KB961894/Release/ProjectReleases.aspx?ReleaseId=2067
Edit:
I know it's a bit odd as it's an old update, but if having issues, it's worth a try
Problems included random lock-ups, driver stopping and recovering, couldn't even uninstall the drivers after some point.
Found the following link in relation to drivers not uninstalling, and so far my machine has seemed stable for a few days on 10.6.
link is http://code.msdn.microsoft.com/KB961894/Release/ProjectReleases.aspx?ReleaseId=2067
Edit:
I know it's a bit odd as it's an old update, but if having issues, it's worth a try