iOS app download zip from server issue

[jmburnod]

Hi All,
At the first open my app displays an installer to download a .zip file (160 Mo) from a server (LD 8.1.6, xCode 8.3.3, iOS 11.2.6)
Sometimes download is stopped before the end
Does someone have an idea about this ?
Thanks in advance
Best regards
Jean-Marc

[jmburnod]

I use urlProgress to watch status but not errors
I saw that "liburldownloadtofile" in "revLibURL" stack have error messages but it is quite complex and some advices would be welcome
Thanks
Jean-Marc