Is there any trick to not corrupt your save game? I've started three profiles, the first one was damaged when I was already at the phantom campaign, second time it was damaged when I was at the third or fourth campaign part and the last time it was damaged when I was at the second to last part.

Memory card had been formatted before starting a new game every time. First time I used just auto save, second time auto save + manual save, when auto save refused to work and the last time just manual save.