Hi Jeff, thanks for your feedback. We're sorry to hear about the inconvenience you are dealing with the Nest Temperature Sensor. We understand how setting it up repeatedly could be frustrating.
The Nest Temperature Sensor should install within a maximum of 50 feet (15 m) of your thermostat, so the sensor and thermostat can communicate wirelessly. You can try to place them closer together as the wireless range can be reduced by walls, floors, appliances, furniture and other electronics.
If the issue still persists, we recommend contacting our support team so we can help you in the best way possible. You can reach us through this link: https://support.google.com/googlenest/gethelp