Hey!
I have 600/120mbps internet, nokia G240W-F modem with TP-Link C6 router, i set up 2.4 and 5GHz wifi.
I can use internet on 5GHz wifi all day, watch twitch for hours, download 100GB game from steam, but when I try to connect to game server, I lose internet every time i hit "log in" button.
It doesn not happen when I'm on 2.4GHz, I can log in and play Path of Exile etc.
When I fail to connect with game server with 5GHz wifi, I"m still connected, but I have no internet. The weird part is I have to connect do 2.4GHz and switch back to 5GHz to restore internet access on this wifi.
It doesn't matter how far I am from router, it happens anyway even if i put my laptop next to it.
It's MSi GF63 with intel AC 9462, so I'm sure it can use 5GHz wifi.
Soon I'll download OBS and record how it works step by step.