There is a palm disease called "lethal bronzing" that first started in Texas about 15 years ago. It eventually worked its way to Florida and has destroyed thousands of palm trees. I lost two of my beautiful palms in my front yard because of this disease. Once your tree gets it then there is NOTHING you can do to save the palm. This is why YOU MUST insist that all tools be santized before and cutting is done.
I now have one palm in the front that is still looking good. I did buy some palm tree fertilizer spiked and pounded them in a circle around my one good palm. Read the instructions on the box befor you use them.
https://www.youtube.com/watch?v=qHQHzLQDJ1s
https://www.youtube.com/watch?v=m9JRmLgpWCk