The hard reset method I was given by Customer Service is to turn on the left turn signal, exit the car, lock it, and take the key fob, mobile key, and key card well away from the car for at least 15 minutes. Less than 15 minutes and you will only get the soft reset, which does restore some functions. Which reset you need to do depends on what issue you're trying to correct.
By the way, I'm having a new problem with the audio. I asked Alexa to play a certain album several days ago. That album info (title, artist, album cover) is staying on the upper screen even several days later, no matter what I'm playing. I'll ask Alexa to play other music, the requested music begins, but the album info from several days ago remains on the screen.
Seven months and 8,000 miles in, we still can't get the audio system to work consistently. We've had problems with bass dropouts, white noise screeching from the right rear C-pillar speaker, soundstage too far forward with balance set to center, and now graphics freezing.
When the system is working properly, it's stupendously good. But those days seem to be coming around more randomly and less frequently.