No need to disconnect. Just make sure you have connectivity on your phone (wifi or 3G/4G), open the Bosch App, go to the 'my ebike' page and you'll see "synced recently", or "synced X minutes ago"; then just turn the Kiox off (left button), it will then sync over bluetooth with the phone, which then uses wifi/4g to send data back to "the cloud @ bosch". Voila.
Only real reason to take your Kiox with you when parking is that, if you paid for the lock option, the engine is locked, which is an additional deterrent from stealing the bike (not much fun when the engine does not work; needs an evil LBS to program another Kiox on it).