We solved the problem by changing wireless band from 5GHz-N/AC to 5GHz-A/N/AC (https://wiki.mikrotik.com/wiki/Manual:Interface/Wireless#General_interface_properties)

@Kevin_Z Hello! I confirm that I received email from your support

I have read in other topics about some "magic" beta firmware for RE305 and RE200 that solves issues with 5ghz networks. Do you have such beta firmware for RE205?

Hello! I cannot connect my new RE205 (EU v.3) to Mikrotik rb952ui-5ac2nd (firmware 6.46.4) on 5Ghz. I installed sniffer on a separete notebook and see the following proccess: 1) step 761. RE205 tries...