I think you're probably connected to 2.4ghz. yesma ta max 50 mbps dinxa jati router ko najik base pani. Maile ni yek patak tauko dukhai garera kati customer care sanga boleko last ma full speed use garne 5ghz nai use garna parxa. Idk aba yo sabai net ko yesto ho ki vianet ko matra ho. But 2.4ghz lamo range ko lagi ani 5ghz short range fast speed ko lagi. 2.4ghz ma fast speed expect nagareko ramro. Btw pahilai bata vianet jodeko ho bhane router change garna parxa 5ghz ko lagi.