One of my app which is made with cordova platform has failed the functionality validation for all the possible devices. That's really weird. Cause when I first submitted to the store it passed in all. I didnt update the build, After 1 month I got an email saying it has failed in all devices.
My app was a best seller in magazin category. Now it is getting 1-2 downloads per day.
Emailed the amazon support team 1 week ago, unfortunately they didnt reply.