I recently purchased a Model S and found that it wouldn't connect to my home network. The Model S would recognize the broadcasted SSID's of my access points (Unifi AP-AC-LR & AP), but the Model S wouldn't actually connect to any of them. The Model S would attempt to connect (tried multiple SSID's) and then it would drop the WiFi connection reverting back to the 3G connection. After creating a new SSID with different password variants, different bands (2.4/5) and installing a repeater in the garage, I found that the fix was in the technology. The Model S requires that you broadcast using legacy protocols and bandwidths. I was able to configure these settings within the Ubiquiti Networks Unifi console for the Unifi AP (Guest AP) and it solved the problem. Attached is a screen shot of the actual configuration page that solved the problem. I hope this prevents hours of troubleshooting by other Tesla owners.