I posted this in another topic with a misleading Subject (aboutIP Server) so I am reposting it now with a more accurate description.
Frequently my iPad Indigo Touch for iOS cannot connect to the desktop app. We have two networks with different frequencies (5GHz and 2.4GHz). If I change iPad's WiFi from the 5GHz network to the 2.4GHz network it will work for a while (several hours) before failing to connect. Then I have to switch back from 2.4GHz to 5GHz. My Android app does not need to change frequencies.
The problem only started recently. iPad iOS is 11.4.1. I think that this problem started when I upgraded to iOS 11 (but not sure).
Has anyone got an idea of why this happens?