On DFS Channels you have to deal with this
You choose a frequency and when the AP detect radar on this one, the AP select new channel

There are only four 5GHz channels without enforced DFS by most regulatories:

After disable WPS Mode in wireless card, problem didn't manifest (for now, 23h+)
I hope this problem will not be repeated.

After disable WPS Mode in wireless card, problem didn't manifest (for now, 23h+)
I hope this problem will not be repeated.

WPS is totally unrelated to this issue (DFS).
Radar problems can sometimes be temporary due to tropospheric propagation conditions (inversion layer).
So it can be coincidence that you were affected for some time and later it disappeared.
E.g. over western Europe (France/Belgium/Netherlands/UK) there has been good tropospheric propagation the last two days,
but now that is back to normal. Don't know about Serbia.

Can I disable radar detection?

When weather institutes become sufficiently fed up with this, they will send out the telecom authority to locate the offenders
and isssue them a ticket.

So, what to do in practice to resolve this?

@pe1chl Ok, let's say you are right. What now I can to do to resolve this? My AP is set auto freq, my stations is set auto freq. So, what to do in practice to resolve this?

Can I disable radar detection?

It is a legal requirement to use radar detection when you want to use certain channels on 5 GHz.
This is because the "primary user" of this band is RADAR and you are only allowed to use those channels where RADAR is not present.
When you run a WiFi link on a RADAR frequency you disturb their operation. E.g. on a weather rain map you will see streaks of
fake rain areas in the direction from the RADAR site to your link site.

When weather institutes become sufficiently fed up with this, they will send out the telecom authority to locate the offenders
and isssue them a ticket.

So you should not operate your links/access points on frequencies where there is RADAR, and the DFS is taking care of that.
It only becomes a problem when the DFS software makes false decisions, but we have not seen proof of that in your case.

When weather institutes become sufficiently fed up with this, they will send out the telecom authority to locate the offenders
and isssue them a ticket.

As an ex MNO radio engineer and current weather service employee I'd ...
[joke-mode=yes]... find rogue wireless operators and execute them on the spot.[joke-mode=no]

Seriously: I can't understand certain wireless operators complaining about recent restrictions regarding use of free radio spectrum. I'd understand if somebody was complaining about new restrictions when using paid spectrum chunk which originally came with less restrictions.

I can remember outrage among weather radar crowd when 5GHz spectrum first got allowed for unlicensed use some 20 years ago. First problems soon started to show so current "witch hunt" is only (one of) climax(es) of the whole story.

As a WISP I would question the wisdom of allowing dual usage of frequencies that both Radar and wireless operators use? It would be best to remove these frequencies from the unlicensed band.

As a WISP I would question the wisdom of allowing dual usage of frequencies that both Radar and wireless operators use?

As a WISP I would question the wisdom of allowing dual usage of frequencies that both Radar and wireless operators use?

Nobody questions the viability of getting into an unreliable business like WISP where you are fully dependent on what others (including authorities) do?

Main issue with radar detection is the unreliability. If it only detected WX radars and nothing else, it would be fine. But for that, radars would have to transmit some digitally signed beacon that could be verified to be 100% reliable and avoid the spoofing. Currently entire detection algorithm relies on detecting series of pulses, it's too easy for it to be triggered by noise, non-WIFI signals and non-WX radar devices.
In the end it's a government mandated backdoor that will turn off your WIFI and all you need to trigger it is $2 radar module from China. The idea of protection for WX radars is good, but actual implementation is more than dubious. Getting a lot of radar detection errors on your channels? Maybe your competitor put this small radar module somewhere near your AP and is just having a good laugh...

I totally agree that radar detection is unreliable also in wireless setting for a given country the radar frequencies in use should be included so that the scan is not starting at say 5180 when radar frequencies used are 56XX.. or a option for us to exclude these frequencies.

I totally agree that radar detection is unreliable also in wireless setting for a given country the radar frequencies in use should be included so that the scan is not starting at say 5180 when radar frequencies used are 56XX.. or a option for us to exclude these frequencies.

Your proposal is totaly unrealistic.

So when weather guys decide to build a new radar, operating od frequency different than the rest of radars, who is going to find all those milions of APs operating in the area?
So when there's a ground control short-range aviation radar, operating in a border area of two large countries, use of that frequency should be banned in whole of the two countries? What if there are enough short-range radars, all operating on different frequencies, should the whole 5GHz band be banned from ISM use?
What if somebody decides that radar signal is not there (for real or "just interferes") and that she doesn't have to use country specific rules? Isn't this the reason for this discussion?

You should be aware that it's us who are guests on 5GHz band and we should follow certain rules not to interfere primary users of this part of RF spectrum.

I won't suggest a ban on frequencies but a option to deselect available frequencies...

... but the real question is how do we identify radar false positives?

So, I need to set no_country_set and put frequency like 5825..
Stupid rule, stupid law, stupid country..

Ty @pe1chl and @pcunite.

Stupid rule, stupid law, stupid country..

No, that would be breaking the law (since you are no longer conforming to Serbian frequency list).