Thanks for your feedback! We're aware that auto-unlock can be unreliable if your device or location is particularly susceptible to GPS drift. If your location drifts in and out of the 100m radius around your Sesame location, you will constantly get the Welcome/Goodbye notifications triggered by the geofence. We understand this is not ideal and we apologize for the inconvenience caused. Unfortunately, we rely on the location provided by your device and there's nothing we can do app-wise if the location on your device is not correct due to GPS drift. We do have plans to incorporate additional Wi-Fi Access Point and server features to improve auto-unlock's reliability in the future, so stay tuned for updates! - CANDY HOUSE, Inc.