Redmi 12 note 5GHz WiFi signal degradation

[kimo uz]

Today noticed that my redmi 12 is failing to connect to router's 5GHz WiFi. It was ok for more than 1 year (since i had this phone), but now it's failing if you go away from the router for more than 1 meter. At the same time, other WiFi clients of 5GHz at my home network are still getting connected as per usual (iphone, laptop, TV) with no issues. I don't even see my neighbors' 5GHz networks.

Just in case i have updated my redmi12 to the latest version by downloading full ROM.

What can be the rootcause? How do i check and resolve this problem?

2GHz connections do work fine, though

(found similar problem with another user https://xiaomi.eu/community/threads/redmi-note-12s-5ghz-wifi-connection-not-available.71310 )

 

[kimo uz]

ok, no more redmi phones

 

[Redmi_note_12s_user]

I was surprised when I saw that the link was to my post but other than that I still can't use 5 GHz connections with my Redmi note 12. It works fine with other devices

 

[kimo uz]

i tried to use another 5G wifi, completely different, not mine - still doesn't connect. looks like there is a chip defect.