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2015 Model S Key Fobs Not Detected

For a few months now my key fobs are not detected when approaching the vehicle, nor inside. I get the error saying key fob is not inside the vehicle, so I have to double press the key to start the car. Both key fobs have brand new batteries, and the issue was reproduced with a brand new third key fob with a fresh battery from tesla. I have attempted updating the key fobs and neither are detected in the car for this either. All of the buttons work fine, but any proximity sensing is completely non functional. Anyone experience this or know what the cause could be? I thought it would be an antenna issue but it seems unlikely that so may antennas would fail at once.
 
I've been having similar issues lately and even replaced the batteries in both of our fobs. Even though I used verified name brand batteries from a known source I'm still having issues similar to what you describe. Similar symptoms of approaching the car and having it not present the handles normally and/or being inside (when at home where doors don't lock) and having it say that the key isn't inside of the vehicle. It makes me wonder if there wasn't a bug introduced with one of the more recent firmware updates that went out to the older AP1/MCU1 cars.
 
BTW, for those who stumble upon this thread because they're having fob issues that haven't yet tried a new battery, I created this post a while back on some important things you should know about changing the battery in your fob as there's some specials steps you should take to avoid issues. It's not as straight forward as you may think. Also just to verify that the issue I'm talking about is separate from the typical battery low symptoms. This is happening on 2 of my cars that I've had for over a year now and all fobs have fresh batteries.
 

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