I have had an Areca palm for a year now, and have been having problems for quite some time with it. The main issues I have had with the plant are over watering and insufficient light. If the palm doesn't get too enough light then it will not be able to use all the water in the pot and that may cause root rot.
You could try putting it in a location where it gets more light for a while and see what happens. Just keep in mind that if you have the plant outside make sure you watch it so it doesn't get too much direst sun.
You can keep me updated with how your palm does through email if you would like. Hopefully you will be able to help it.
My email is
raven_boy14@yahoo.com.