2.4 Ghz Wi-Fi problem

After the last official firmware update the 2.4 Ghz Wi-Fi has started to work very poorly, very weak signal. At 5 Ghz, everything is Ok.

I checked it on my 2 tablets and on the forum 4pda.ru there are the same reviews.
How to solve this problem? Is there any firmware fix that eliminates this bug?

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