I'm currently experiencing the red wheel of death RWOD
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It's been working fine today. I've been parked for a while, on phone, etc. The CarPlay screen was still visible but noticed that the time wasn't current, so I refreshed browser. My phone is still connected via WiFi to CarLinkit device. I'm actually posting this by connecting to the TeslaAndroid WiFi, so it's got connectivity.
Also I noticed. I turned off Tesla's WiFi. I can still click on the red banner in the top right and get release notes.
Gonna power cycle Pi and see if that helps.
And it did. Took almost exactly two minutes from the time I powered it on for the Tesla-Android WiFi signal to be visible. When it came on I noticed CarPlay came on the screen immediately, so the car must have joined the WiFi the moment it saw it. Note that I'm parked away from home and any networks that my car already knows.