[Dr. J]

2. Able to get into car using either iPhoneX or key card (either works) but after I get in, the car is 'dead' for about 15 to 30 seconds.

Not that this will help, but I'm curious if you ever tried using the key card to "start" the car, and if that made any difference.

From Electrek:

Once the driver has swiped the card, they have 15 seconds to press the brake pedal to power on the car, but they don't have to go back outside and swipe again if they wait longer. There's also another RFID transmitter in the center console:

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The driver simply has to place the card behind the cup holders for another 15-second authentification period.

 

[Dr. J]

I've been having the same issue for several months and finally created an appointment. Got an email two days later saying they remotely checked the logs on my car and its a known issue that will eventually be fixed with a software update, and that it would be pointless to come in.

I asked if it was software related why does it affect some cars and not others. They said that the affected part was provided by Intel and while part numbers may be the same, the components that make up the part may vary slightly.

Typical: software vendor blaming the hardware vendor. This could be a case where Tesla's change-parts-on-the-fly culture bites them in the butt.