Accualy i don’t have router with 5ghz. But today i will get archer c80 and try 5ghz . My adapter connected to 2.4 GHz wifi very well on 1980x1080 resolution. But when i turn on CS:GO with 1600x1200...

@Anthony_Thet I have the same problem on win10 with t6e but only when its 1600x1200 resolution. This is strange but when i change my resolution to 1980x1080 or any different resolution it works fine...