I am positive. I remember my PG especially because he lost driving in the 4th week since I had the team, 3 seasons ago. I found it odd as I downward popped 2x in the same week (driving on the 21 y/o PG and stamina on 22 y/o C). I seem to remember being told in a BB Mail when I asked friend that there is the minor potential to lose abilities and the older you got, the greater the likelihood it would happen. And that I was unlucky. :D
I always thought it possible for any player to slip a little. But if that is not the case, I want the refund for my PG. ;)