Hi. We could not reproduce such behaviour, could you kindly answer some questions so we can investigate it?
– What is the NoMachine version installed on server side?
– What is the Android device model?
– Are you starting the connection through a LAN discovered server item, or by using a manual connection (configured with the wizard)?
– What is the reason why the server goes offline sometimes? For example is the server switched off, or is the device changing the subnet?
Please note that for the way the LAN discovery works the client could require some time to receive the information about the server, even if it should never take more than one minute or so.