Mac freezes in photos

I have been working on a photo book in projects. I had completed the book, and then suddenly half of it was gone. I tried a repair, without success. The project (at least the second half) seems forever lost. I have endeavored to re-create it, but now my whole Mac freezes up when I am working on the photo book. It has happened twice now. By the way, this has happened since updating to High Sierra. Is there an update in the works that might fix this problem? My computer shows that I am currently up to date on all updates.