Mark,
My dealer replaced new batteries in my advanced keys. He told me the voltage of battery should be more than 3.2v while one of my key is 2.8v and another one is 2.6v.
After he changed them and told me a way to sync the key with the car -- put your key into ignition and start the car and press "unlock" on your key.
You can give a trial -- hope this sync can let your car and key talk to each other better.
Otto
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