Elegoo Saturn - waves across the surface

Hi! I've been using a saturn for a while now, but all of a sudden it started printing pieces with strange waves all over the surface. Can anyone tell me what could be causing this? As I said, so far it has never happened, so I thought the problem could be a wrong setting in Chitubox or worse the wear of some mechanical part, what do you think? If it helps, the printed piece is the one attached and is 10 cm long and 4.5 cm wide. Thanks in advance to everyone!

Hi there, this isnt fewer nuymber of support?