(it's called the Ezyfus, right?) The Ezyfus has always been my favorite vehicle. But now it's unusable because it bucks into the ground and breaks itself when you turn above 75-100 km/h. Here's a video: If you're reading this within 30 min of posting, the video might still be uploading/processing.
Turns out I put my computer to sleep halfway through the upload. It should be viewable pretty soon. And no, the handbrake isn't on.
Well if that's not it, I'm not sure. I haven't come across anything else that would make a vehicle do that.