It may be in some shock from transplanting, or, if it wasn't planted out but just brought home from a garden centre, it has spent its life so far in a greenhouse and is suffering from sudden changes in its environment, but palms are pretty tough. As long as the core is OK, not brown, then it's still alive. Palms dump leaves all the time if they get in any sort of bother, the older leaves brown off first.
I'd be more concerned about getting it thru its first winter. Is it in a pot? It may survibe winter inside the house if so.

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The secret is the soil.

I bought it in a pot from a outdoor garden show and its now planted.
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Give it a drink of seaweed or kelp extract Bobb. It's available from most plant places. It will help alleviate the transplant shock. What will you do with it in winter?

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The secret is the soil.