I have experienced it in several sites but never have I tried it in any casino before since I don’t want to use vpn and out my account at risk, even sometimes I’m unable to visit or open sites like Reddit and quora but google search works very fast and when I change the network provider or turn on vpn everything becomes normal.
Can you access Reddit or Quora without a VPN? Sounds like a DNS issue to me. One of the DNSs my provider uses is very slow when responding to requests to social media, but they don't necessarily block them. Maybe try changing your DNS to see if it fixes your issues. Sometimes it can also help bypass your ISP blocklist especially when your country doesn't block websites you're trying to access. I am not sure if VPN-friendly casinos allow us to use that though, you better ask their support if you can't find it on their ToS. CMIIW.
Yes I can open Reddit and Quora when my internet connection is normal thats when all other sites are opening. But as soon as the issue starts and sites are no longer opening except for google and my social media apps during that period I won’t be able to access Reddit or Quora without having to use a VPN.
I haven’t actually touched any settings that’s DNS related or so, but since you mentioned it I’ll try and look for some tutorials on YouTube and download them so that when the issue comes back I’ll try the settings and see if it will solve it.