Wifi: low speed on 5 GHz, good 2.4 GHz (AC1200 T4UH)
Hardware version of the device : 1.0
Adapter operation mode : Accepts WIFI
Operating system : Windows 7 64
What antiviruses / firewalls are installed on the computer : no
Problem description : Put the router with Wifi distribution in two bands - 5Hz and 2.4. To receive a signal from a computer, I purchased an AC1200 T4UH adapter. In the 5Hz mode, the speedtest shows a low download speed - 5-6 mb / s versus 95 mb / s per download. Downloading any files is simply impossible. In this mode 2.4. Hz picture is completely different, the speed is much higher.
The signal level is high, all sticks.
A laptop and a phone at a greater distance show a jump speed of not less than 55 Mb / s at 5 Hz, perfectly pulling files. Tell me what could be the problem? Already updated the driver from the site - did not help.