Very possibly because i don't have 5G, but the response of this app is pathetically slow. Doesn't matter how close i stand, or if i'm using wifi and standing right next to my router. Would be a nightmare if the smart key was missing or dead took 2 full minutes to shut off the engine after finally turning it on. Eek. A progress bar would be a good idea too, to at least tell if anything is happening. Standing there hitting the button repeatedly negates the whole purpose and intention of the feat