Wireless technology is not foolproof and while there could come a day where it is (even though that seems highly improbable), the reality is today there are still limitations to it. One of which has been documented previously and it is the issue with the connection. There will be times where your mobile device will not sync with the scale. When this happens, here are some steps you can take. One, ensure that the latest version of your iOS or Android device is installed. Next, make sure the application you are using is up-to-date.
If this still does not solve the issue, power off both devices and restart them. Sometimes, this simple method can do the trick. For Wi-Fi connectivity issues, try resetting your router. If this still does not fix the issue, it could either be your internet connection or you may have to contact the seller.