[ssh]

I'm betting the iDrive reset will fix this.

 

[ssh]

Rebooting the Center Display (Hold the Volume Button Down) seems to have done the trick. I also made sure my iPhone saw the car's Wi-Fi and connected to it. I didn't make any changes to the Wi-Fi settings on the iPhone or the car, so I kind of doubt that had anything to do with this issue.

To be precise about this for other readers, holding the volume button down resets iDrive, not just the display, and there are multiple versions:

1. Press and hold the Vol knob until the console screen turns black and reboots. This is a basic reset.
2. Press and hold the Vol knob until the console screen turns black and reboots a total of 3 times. This is a harder reset.
3. Get into the car and press the Start button 3 times (don't press the brake) then press and hold the Vol knob for 3 reboots.

Start with the first. That is likely to fix this problem. If it doesn't, try the second. I'm not sure if you'll need the third, since that's usually for multiple issues according to @niam.