https://www.techdirt.com/articles/20170814/14322437995/smart-lock-vendor-locks-hundreds-out-their-home-with-bungled-firmware-update.shtml

So we've talked repeatedly about how the real "smart" choice in the era of "smart" internet of things devices is often -- dumber technology. Whether it's your smart refrigerator or TV leaking your gmail details or viewing data over unencrypted connections, your smart car opening the door to potentially fatal attack, or your smart doorbell creating new attack vectors into your WiFi network, more often than not you're quite frankly better off with the older, less sophisticated versions of these technologies if you want the smart path toward a more secure life.

The latest case in point: smart door lock vendor Lockstate managed to completely disable the smart door locks of an estimated 500 customers after a botched firmware update left customers unable to access their own properties: