I've just been told by Tesla Chelmsford (UK) service centre that my rear sub frame is cracked. My car is a 2014 P85. Drive unit (the 3rd one since 23,000 miles) was replaced in July. I have driven 5000 miles since then, so the car is up to 73,000 miles now.
It was all fine until last week, when I missed my turning on a country road. I braked hard (there was nothing behind me), came to a complete stop, put it in reverse, backed up about 40 feet, came to a complete stop again, put it in drive and then had this bang every so often from that point. I thought it was sloppy driveshafts, but it only made the bang in reverse. Tesla are now putting a quote together to fix it, as its not part of the drivetrain (go figure?), and apparently putting it into reverse before stopping can cause this. You can't actually put it in reverse while still moving , as the software stops that happening, so they are lying.
Looking at going legal with this, as I have all the time in the world, and will quite happily stand outside the Tesla showroom telling all the new potential customers about how Tesla really look after their customers. As an Engineer, I can see this is a piss poor design. The fact that it breaks with normal driving to so many of us just proves that.