HAP | Swift implementation of the Homekit Accessory Protocol

I've got a router Mikrotik hAP AC2. Recently I've updated RouterOS to version 7.1.3 and have found that 5GHz access point has issues.

My notebook sometimes disconnects from 5GHz wlan, and one of smartphones in my family doesn't connect to 5GHz at all.

Here is the plot of wifi signal strength, that I've collected using my notebook located in direct visibility of the router at the distance of about 5-6m.

Cyan line shows 2.4GHz signal and red line shows 5GHz signal. Numbers are -42dbm for 2.4GHz and -68dbm for 5GHz.

My impression is that generally this is not normal. I repeat, there were no obstacles between the notebook and the router, only thin air.

I've tried to reset configuration for 5GHz wlan, change its region, but without success.

How can I fix this?

Here are current settings:

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