You can consult the connection status between your accessories and your Smart Home Tablet from the All accessories menu displayed on the left. On this page, press the Bluetooth icon at the top of the screen to display the connection quality or press the name of the accessory and then select Connection in the contextual menu that will be displayed.

If the signal is weak or missing, make sure you followed the recomended distance for Bluetooth Smart® communication (around 20m). Also make sure that your accessories are not fixed to metallic items. 

You can also restart Bluetooth® on your Smart Home Tablet from the Android™ settings. Your accessories will reconnect automatically if they are not in sleep mode.