I have discovered that when I have to exit the game for any reason before having finished the hole, when I return and finish the hole, it will not give credit for having hit the fairway with the drive.
Here is my most recent example. I hit every fairway at Chambers Bay, and it shows that on my scorecard. I had to temporarily exit the game due to PC problems before putting out. After returning and finishing the round, my scorecard still shows that I hit every fairway, but my stats "Driving %" is not 100%. Instead, it reflects that I had missed a fairway.
I have had this problem several times. So I have been watching close to see if that is really what is happening. Has anyone else ever noticed this? I pointed out the error in my stats to CS, and speculated that what I am describing is what has caused the issue. However, I think they kind of ignored my speculation as to what needs to be fixed.