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

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.