Had to repatch games?

Has anyone ever had to repatch a game? I noticed both resident evil 5 and rockband 2 unpatched somehow, I had to repatch themfor some reason, god knows how many other games I need to patch. Anyone know howthshappend?

I cleared the cache on my Harddrive because I had a problem and had to repatch all my games. Did you clear the cache on your Harddrive?

No, not intentionally at least. haha