I can't download anything, my downloading files fail if I am using my phone, without having opened the Downloads app (it fails even if I am inside  the app) ..... Also,  I download a file, my WiFi internet connection is lost for a while/or the screen switches off/or the phone powers off, and at reconnecting, it asks me to continue downloading, but after 2 seconds the download fails (tapping "try again" fails, too) .....