Sometimes, app updates aren't enough to fix an issue. You'll need to update your Kindle software as well. First, make sure that your device is plugged into its power supply and connected to Wi-Fi. Now, go to the Settings on your Kindle tablet and tap on 'Device Options.' From here, tap on 'System Updates.' Tap on the option to 'Check Now.' This will scan for any available updates. If one is available it should appear and you can follow the steps to perform the update.