omgosh! That is exactly what I do!
It doesn't happen to me too often, but occasionally I'd lose my Cracking Up prizes. It happened again with the Kung Fu prizes, so I decided after I do an Adventure or unlock a game, I'd go talk to Berry in the lobby (mostly because I can't stand Goo [sorry Goo fans, lol]) and so far, I haven't had to go back and re-win stuff.
~Vicks