MacBook Pro 2018 can’t use 80Mhz wifi channel

I have an wifi ac access point, which works on 153/80Mhz channel. However my MacBook connectes to this access point it switches between 20Mhz/80Mhz channel bandwidth several times and then stops on 20Mhz.

RSSI/Noize is -47dBm/-97dBm, there is no other 5Ghz stations according to the WiFi Explorer.

How can I find out why my MacBook can’t use 80mhz?