Each time the iPhone app gets sent to background and the reopened (for example, while switching back and forth between two apps in a couple of seconds), it gets reloaded as if it was a cold launch, requiring to load stuff over the network. This is suboptimal and doesn’t provide a good user experience, since it adds delay to operations in a moment (entering the building for example) where the internet connectivity is flaky (due to automatic switching from mobile network to office WiFi). The app should simply reopen, showing the last information that was available until few seconds ago.