Dowloading data

When I download from my phone when Im in wifi once all the information has gone through I keep getting a screen that keeps saving the data then its jumps out of the app to my home screen. Its happened before and I had to uninstall the app for it to come right. I lost a lot of data when I did this last time. It has happened again. I’ve tried logging out this time and now the app won’t log back in on the phone. Any one else have this problem.