dont wash it duh. if you dont want it to crack, fade, etc, youre only supposed to wear jiberish if you either a) never ever plan to wash it or b) never ever get it dirty..... duh
but actually, it could just be the screenprinting, i have some shirts that have been washed probably close to a hundred or so times and have printing that is still intact, while others have been washed a handful if that and the printing looks like shit