A loose USB cable is the most common cause of lost connection errors.In some cases this can be ameliorated by using a different cable or different USB port. In any case, it's a good idea to place your phone or tablet and the USB cable somewhere out of the way, where it won't be jostled accidentally as you work with Cozmo.When Cozmo's battery runs down, he will drop his connection to your phone or tablet, which in turn will disconnect from your laptop. Battery voltage is displayed at the bottom of the Calypso world map screen whenever you run a program. Cozmo's backpack light will glow red when his battery is almost out.Your phone or tablet must remain connected to Cozmo via WiFi, which means it will not have Internet access. Each Cozmo robot is its own WiFi network. If you switch your phone or tablet to a different network you will lose your connection to Cozmo. Note: your laptop's WiFi is not used to communicate with Cozmo, so you can still access the Internet from your laptop while talking to Cozmo over the USB cable.