Urgent help wanted for my Hawaiian palm!

Hello,
I have just read in the August post written by Greybelle how her Hawaiian palm died.
I bought 2 Hawaiian palms (Brighamia Insignis) in June, one for my daughter and one for myself). Mine died 6 weeks later. My daughter's has just started rotting from one side.
I wonder if anyone here knows how to save it.
We are both plant lovers and we both have a lot of outside and inside the house plants. We follow all instructions for plants and we always try to get solutions on internet to grow healthy plants though of course we are not plant specialists. Each time a plant dies is a great upset for us.
We would appreciate any advice you could give us.

 

I have read that the trunk of the "Hawaiian Palm" is like a cactus, a water reservoir. It can therefore survive for six weeks without water. Just like a real cactus it cannot stand too much water and the trunk can rot. Watering on average once a week. First feel the earth and if it is still damp, wait for a week.