The only other thing that I can suggest is go to Settings, find Apps and make sure that it isn't still running in the background, if it is force it to close, if it isn't, reset the iPad by :
Begin by pressing the on/off and home buttons at the same time. The on/off button is located on the top right corner of the iPad. The Home buttonis the round one at the bottom center of the iPad's front
Continue to hold these buttons until a slider appears at the top of the screen
Let go of the on/off and home buttons
Move the slider left to right to turn off the iPad (or tap Cancel if you change your mind). This shuts down the iPad
When the iPad's screen goes dark, the iPad is off
Restart the iPad by holding down the on/off button until the Apple icon appears. Let go of the buttons and the iPad will start up again
I have been having this issue as well for the last week. The app opens and you see amazon Alexa, followed by three dots and then a bank white screen. I have quit the app more times than I can count, restarted the phone, updated everything, uninstalled and reinstalled and still I have the same result. Please can I have any suggestions to get this working again.