You say it's the router or your data network, but I think not.
It often happens that the apps are not legal when they got in his day, and you have the patch that makes the read and install.
iTunes recognizes, but does not install that missing security checks, just what a pirate app skips.
Sorry I can not give details, but in the forum are not in favor of piracy, a thousand pardons ... : (
After a while, if you do a reboot, are removed if they are not loaded.
regards