If every time (or oftentimes) you connect to our network, you receive a request for authentication, this most likely means that your device changes its MAC address every time you log on to the network. We do not guarantee operational stability of such devices. You need to find a way to disable random MAC address. Apart from that, automatic de-authentication is carried out considering that the number of mobile devices in the network is constantly growing, they change owners, are resold, lost, etc.