Hi I already mention this on my other post that some of the manga not loading probably like you said an ISP issue as it works when I change dns or use vpn, this could potentially drop your users as they will stay away from not loading anything so I suggest just make a "server selection" so we have an option what works.
Use a VPN
There is no server selection. One series is in one server, that's it. I can't do anything if your ISP blocks the server.
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