Similar problem here. Qu-Pad on iPad works fine, as does Mixing Station on Android 8.1, but Qu-You on Android 8.1 can never connect, just gives ‘Connection failed’. Doesn’t see the Qu-16 on the network and if you put in IP address it makes no difference.
Qu-16 1.93
Qu-You 1.90 on Android 8.1
Qu-Pad 1.92 on iOS 11.2.2
Mixing Station 0.001.32 (44)