Review on Wi-Fi router ASUS RT-AC66U, black by Hien Quang ᠌

I bought this device a couple of days ago. Internet tincture is simple. HOWEVER: the speed of the wireless connection was only 150 Mbps at a frequency of 5 GHz, 72 Mbps at a frequency of 2 GHz and, ATTENTION, constantly fell to 5.5 Mbps! Which was really shocking. My old DIR-320 gave out stable 54 Mbps without failures. 2 days of "dancing with a tambourine" (firmware upgrade, channel search, etc., etc.) did not lead to anything: I handed over this miracle back to the store. Thank you store. Accepted without question or reproach. Maybe I'm unlucky with iron, I don't know. But here is such an experience with the RT-AC66U.