I started hearing a slight clunk at low speeds about a month ago. I mentioned it to a service guy to see if it was ok when he was giving me a ride to enterprise back in March and he assured me it was fine. Then my husband started hearing it and last night our car was limiting how fast we could go. It wouldn't let us go faster than 90 and kept giving us a line on the kWh. we had planned to go to a sounders (soccer) game downtown and tesla said we could park in their lot so we asked if they'd take it for a spin and let us know if everything was ok. After the game we got back and we were told that our inverter is going to need to be replaced and maybe some other things. The whole underside including a tire was off. We only have 13,000 miles on our 6 month old car.....I LOVE my car don't get me wrong but now I'm a little worried that such a major part has failed so early on. And am a bit skeptical of that one service place now because he let me walk away letting me think things were fine and they weren't. How many others have had their drive units replaced? We have a P85 On a positive side. The seattle SC has loaner cars!!!