My i5 17" would randomly freeze too and I linked it to the auto graphics switching. Basically, with it off my unit would appear not to freeze anymore. However, I did take it back and they put a new system board in there. I did a system profile before I sent it in. The only difference I see on the GT card is that my previous system board had ROM 5941 and this new or replaced one is ROM 5940. So far with auto switching on I haven't had a lock up.
I noticed nothing different on the system profile after I did the graphics update today. I would think that something would change there to show the new version, but maybe not.