Please check if the vehicle is in good signal condition and if there is any insufficient battery power. The core component of the App and T-Box, requires power from the vehicle's lead-acid battery. If the vehicle has low battery, start riding the vehicle for a distance and the App will reconnect with the vehicle (Note: Do not remove the vehicle's battery, otherwise T-Box will not work). If the signal is good and the vehicle is powered properly, seek help and provide feedback through the help center in the App.