Not quite two weeks ago, I started driving home, got on the highway, pulled the cruise control stalk to engage Autopilot, and... warning beep! Cruise control disabled. I had to drive 80 miles home by hand. The horror! I tried cleaning the radar and camera and rebooting the computers, no dice. Tesla checked the logs and said it had to come in. They couldn't squeeze me in for a bit more than a week, but OK, I can still drive the car. I drove around like this for a few days, then one morning I get a text from my wife with a photo showing the Autopilot engaged. It had come back to life! I still took it for the service, of course, in case something was still wrong. A little while later they gave me a call with this odd bit of info: the frunk latch was defective, and that's why the cruise control wouldn't engage. This puzzles me because I'd think that would be a safety thing that would prevent the car from driving altogether, but I guess the Autopilot end must be more sensitive or something. Sharing this news with my wife, we mentally reviewed the previous week and realized we hadn't used the frunk for several days, but we finally did use it for groceries the night before it started working again. We think that using the frunk reset the failure somehow. Tesla still replaced it, and took care of a couple of service bulletins too. But I thought I'd share, because it seems like it could be handy if you're in the middle of a long trip. If suddenly cruise control won't engage and you've tried everything else, you might try opening and closing your frunk (and maybe the hatch or doors?) to see if that helps.