6 week old M3 and have been fighting a stable connection to our WiFi at home since day one. It would connect one time, then the only way to connect again would be to force a reboot using the steering wheel scroll buttons, it would connect again and that was it, once disconnected it wouldn't connect without a reboot. No other issues with wireless devices in/around our home with 300-400+Mbps throughput
2 days ago I removed the Unifi AP BeaconHD from our network and left main access point, a UAP-AC-Pro, everything was setup for 2.4/5 with the same SSID/PW. The BeaconHD was in the garage within 10 ft of the passenger side mirror.
Since removing the BeaconHD the car has connected to the WiFi with no intervention while parked at home, even downloading the latest update this evening without me knowing. It is connected via 2.4, but that is fine for updating, looks like this update was ~650 MB. Fingers crossed I have our connectivity solved...Next step is waiting for pickup of our 2nd M3 in May/June.
I noticed some mention of MAC's, here's the first 6 of our M3: 4c:fc:aa