Randomly, when I launch PSO2, it checks my files and redownloads some of them.

[caked]

Does anyone know why this is happening? It's a pain having to wait for the files to redownload when I want to play, but it doesn't happen every time I launch. Also, I'm sure it's not a patch, as it's happened to a friend, but not me, when we both launch the game at the same time.

Any insight is greatly appreciated.

EDIT: It seems that there was a patch last night that I was unaware of, so that might be the reason we ran into issues last night.