New to my Tesla X, twice got into car and found phone key not usable to drive car. Second time noticed that car downloading update, tried to reconnect phone to car no luck. Once the download of update completed, my phone key once again was fully functioning. Should be some note of this in factory manual so to let owners know of the problem. Just need to wait for update to finish and use Tesla key card. Spent a lot of flustered time trying to fix phone key, when only needed to wait.