Well GAS is now completely unplayable for me.

I'll have to shelf it until I can figure out what is the actual problem.
Several other games seem to play all right, but I do notice odd problems here and there at random times, and often when saving and loading. GT6 was perfect on-track but had some problems loading things in menus. I rebuilt the file system and database from the safe mode menu, and deleted then reinstalled the GRID game data. It ran without a single hiccup through the intro movie and a short practice and qualifying and about 2 laps of a race, then went back to not running for more than 20 seconds without hanging up. Can't drive like that. Tends to take ages to load the next session after finishing one too.
I'm hoping a reformat or new hard disk will fix it. Not sure why Grid is by far the worst affected, but I have a lot of games I haven't tested yet.