I see on the old palm board Dave's La Habra Travelers died suddenly. I had that same thing happen to my GBOP planted right up against my home...with no gutters. I think the winter rains plus months of chill soil creates some kind of root rot. I think if you look around the net every now and then you read of somebody who had a GBOP just flopp after years of thriving. He might try cutting the trunk like a giant cutting and re rooting that. Its worked with GBOP.