Good day. We're having a very odd issue with iOS devices - iPads and iPhones - "losing" a local server. The server is a Mac Mini on High Sierra. The devices are an iPad Air 2 on iOS 11.4.1 and an iPhone 6S on 11.4.1. The network is WiFi, using an AirPort Extreme.
Here's what's happening: The devices, after running for a while, simply lose track of the server. The server doesn't show up in the Hosts dialog, either in Local or in the saved host (it says "no files available). But both devices can see a server hosted publicly on FMPHost.com. Quitting and restarting FileMaker Go sometimes corrects the issue; sometimes, it takes a reboot of the affected device. And the time frame varies as to when it loses the server. However, my iPhone 8 does not seem to have the problem (using the same iOS version).
Has anyone seen this sort of intermittent issue before? Where should I look for possible causes?