There could be many things, and one of them would be general network issues in between a player and the nearest Cloudflare location. Those types of issues can be very hard to pinpoint. In addition it could be the players antivirus or firewall software, their wi-fi or router. This is why we kindly ask for support tickets to Customer Support so they can go through debugging of often seen local issues and if needed get the necessary information for the network admins.