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Wife’s Phone Key Not Working

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My wife’s phone key, which is the secondary key, will not open the car almost always. I’ve deleted her phone key twice and re-enabled it both times, and it works immediately but then will not open the car unless she opens the app. Once she takes her phone from her purse and opens the app it always opens the car. This has never happened with my phone key, which is the primary phone key. Any ideas why this is happening?
 
Mine as the primary has started doing that with an iPhone. Believe this is related to the latest update, since it wasn’t a real problem before. It’s embarrassing to walk to your car which would work 90% of the time and now won’t open up reliably just 5 minutes after it locked.