Ok this has happened to me too! sometimes, even just fighting regular fiends it happens, and the colors get all distorted. I immediately save, and reload...Now, are you playing FF8 on a PS2? Cuz that's what I think it is. It NEVER did that ever once when I had the PS1. Only started after I got PS2.... I thought it was my machine or sumthin.... maybe it's just a freaky PS2 glitch?