just got my g6 back from the shop (3rd visit)...they changed out the left strut and bearings...*seems* to have done the trick. mechanic said w/the strut the issue it would make sense i heard the clunk sound most when turning and driving slow (most pressure on the strut). maybe have them check that?
most states lemon laws say they get 3 chances to fix it--i live in minnesota, where they get 4 (which sucks). for the best info on the lemon law, call your attorney general's office.