2001 325ci convertible key issue

Our BMW came with the electronic key option where there are buttons to lock and unlock the doors and unlock the trunk. Wife tried her key and it
wouldn't unlock the door or open the trunk. I tried it after she got home and it worked fine. A second key we have stored at home also worked fine. Thought the battery might be bad in the key but then noticed in the service manual that the key has a rechargeable battery and never needs replacing.
Anybody have this problem or have any suggestions. She is using the second key that never showed problems but we are still not sure what the story was with the key failure.
Thanks for any replies
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