Toggle Bluetooth off and on - Under Settings > Bluetooth - switch it off and leave for a few seconds. Then switch on and search.

Update iOS - Make sure you're on the latest update on iOS - Settings > General > Software Update 

Force a restart - Switch off Bluetooth (Settings > Bluetooth) then power off the iPad. Turn Bluetooth back on.

Forget Device - Go To Settings > Bluetooth and locate your device. Press the (i) button on the right and tap on Forget this device then Confirm.

Full Network Reset - You can reset your network settings by going to Settings > General > Reset > Reset Network Settings. Please note: This will take a few minutes, reboot the iPad and reset all Wi-fi, bluetooth and cellular networks - which will need to be set up again. So keep your passwords handy and don't try this during service.

Make sure you are on the latest version of Bustle - head to the app store on the iPad and install any updates

Check your iPad is still compatible with the latest iOS and Bustle versions - more here.

Do a full Delete and Reinstall of Bustle to make sure you have the freshest of system files.

Restart your Bluetooth device.

Check for any Updates to your Bluetooth device's software or firmware

Contact or search the manufacturer's help docs for any known issues and resolutions.

Try a different iPad to see if the same issues persist. Another iPad on a different iOS version may work (there are a number of bluetooth issues reported on iOS 13)