iOS9 iWD will not run

the title is still true for me. I have an iPhone 4S with IOS 9.1. I installed WDliveapp today and when I run it, it just displays the start screen (clouds and lightning bolts) for 12 secs then closes. If I double-click the home button, the app is still active, but if I select it again, the same happens - displays the clouds and lightning bolts for 12 seconds then closes.