Default My Phone stuck on samsung logo when i installed DN3 ROM after wiping PhoeniX ROM

Good morning
i installed PhoeniX ROM on my phone and today it freezed on boot screen after a restart, i installed DN3 v4 rom which i tried before and keeping it always on my sd card, but unfortunately stucked again with samsung logo, so i had to install PhoeniX ROM again and my phone is working
all what i wanna know is why this happened and why i can't go back to DN3 Rom ??!