There appears to be a bug that has been causing my mobile connection problems. Sighthound works fine on my mobile, until there is an interruption, even for a second or two, in the internet connection on my server. When Sighthound tries to reconnect, it shows the cameras operating in the viewer, however, it does not close and reopen the Sighthound background processes. The 'server status' in the 'remote access' panel is not re-established. These older background processes keep holding the open port and prevent a connection being re-established with the mobile app.
My internet connect drops out frequently, but only for very brief periods. Any drop out stops the mobile app working.
