Given that the two versions use *exactly the same code* to connect, something must be different in the environment. It could be the device, the setup, some firewall on the android device, the size of the library, or something related to where the books are stored. Guessing without any further information, I suspect that it is
the size of the library.
If you send me a
CC debug log from both the demo and full version then I might be able to tell you what that difference is.