Just went to fly after being sick for a couple months and found that the DJI Go 4 will not open on my Samsung Tab7. Installed and uninstalled several times. No luck. Found a post in the comments of the Play Store app that had MANY complaints of the same thing. Can't believe that this did not hit this forum. FOUND THE CURE. Don't use the Play Store app. Go directly to DJI.com - Support - Downloads - and load it directly from DJI. That worked first time.