My Model S came with a 3G connection and everything worked pretty well. Then one time I decided to tether it to my phone. Soon after I got a software update,

My Model S came with a 3G connection and everything worked pretty well. Then one time I decided to tether it to my phone. Soon after I got a software update, and I went ahead and applied it. Big mistake. The update not only changed the GUI substantially, but also broke the navigation system and the voice command system. The navigation system now gives two or three instructions and then nothing, it'd still be active and following the route on screen, but no more instructions. The voice command system took around 5 seconds to get ready to record, while it was instantaneous before the update. I took it in for service. They seemed to know about the navigation system problem. But all they could do was to apply the latest update. It didn't fix the navigation system, and the voice command system now takes around 10 seconds to get ready. Overall I still like the car, but I don't think I'll ever get another, not while they're still pushing out half-baked software updates that could potentially cripple critical functionalities.