Sorry nobody has replied to you until now. What I would check is if your IP is changing.
Try going to https://ifconfig.me/ prior to playing and make a note of your public IP. Check it again after you get this message. If your ISP is changing your IP, it might cause something like this.
Also check your LAN IP for the same behavior.
Command Prompt: ipconfig, find your network adapter look for IPv4 address.
ifconfig will give you similar information