The freezing problem is usually because the controller cannot ping the server or is having trouble performing NTP sync. So here are my suggestions:
go to options, and turn NTP sync off, Auto reconnect off, also set DHCP off, instead, use a static ip (make sure the ip is compatible with your network, and make sure you set the correct gateway ip as well, i.e. your router’s ip).
See if these help eliminate the freezing problem.