Xiaomi Redmi AC2100 network instability mt7530-mdio

Hello, I'm asking for help from the community, as for the second week I can't solve the problem because of which I can't use stable internet.
I used the original build was 22.03.3 r20028-43d71ad93e/Kernel Version: 5.10.161, 15 months everything worked stably. Then I decided to try to install AdGuard on my router, for this I updated to the current OpenWrt 23.05.3 r23809-234f1a2efa build, installed AdGuard via OPKG using LuCI. Then I moved the dnsmasq process to port 5353 and AdGuard to port 53. In the process of configuration I realized that the router power is not enough, I ordered a RPi5 for AdGuard and reset the router to default settings. That's when the problems started, I can't understand what caused them. Some sites do not load, for example dnsleaktest.com, including openwrt.org and many others, while many other sites work fine. I have to use a proxy to go to them, my neighbor has the same provider, everything loads fine, I connected an old router, also through it everything opens normally.

General Information

Hostname	AC2100
Model	Xiaomi Redmi Router AC2100
Architecture	MediaTek MT7621 ver:1 eco:4
Target Platform	ramips/mt7621
Firmware Version	OpenWrt 23.05.3 r23809-234f1a2efa / LuCI openwrt-23.05 branch git-24.073.29889-cd7e519
Kernel Version	5.15.150

The router logs show the following information:

Kernel Log

[312367.021380] mt7530-mdio mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[312367.029484] br-lan: port 1(lan1) entered blocking state
[312367.034797] br-lan: port 1(lan1) entered forwarding state
[312367.775790] mt7530-mdio mdio-bus:1f lan1: Link is Down
[312367.781207] br-lan: port 1(lan1) entered disabled state
[312370.201360] mt7530-mdio mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[312370.209489] br-lan: port 1(lan1) entered blocking state
[312370.214797] br-lan: port 1(lan1) entered forwarding state
[312370.955547] mt7530-mdio mdio-bus:1f lan1: Link is Down
[312370.961017] br-lan: port 1(lan1) entered disabled state
[312373.297996] mt7530-mdio mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[312373.306100] br-lan: port 1(lan1) entered blocking state
[312373.311465] br-lan: port 1(lan1) entered forwarding state
[312374.942565] mt7530-mdio mdio-bus:1f lan1: Link is Down
[312374.948236] br-lan: port 1(lan1) entered disabled state
[312377.405581] mt7530-mdio mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[312377.413684] br-lan: port 1(lan1) entered blocking state
[312377.419035] br-lan: port 1(lan1) entered forwarding state

How does the Pi5 come into the picture?

Acts as a DNS server for the router

In the WAN settings
Use custom DNS servers 192.168.1.125
Since AdGuard running directly on the router loaded it to the maximum to constant process failures and it was decided to buy for this RPi5

The problem is not related to RPi5, even if you remove it from the scheme by setting "Use DNS servers advertised by peer", the result is the same, some sites don't load.

of.....???

ping openwrt.org

PING openwrt.org (64.226.122.113) 56(84) bytes of data
64 bytes from wiki-03.infra.openwrt.org (64.226.122.113): icmp_seq=1 ttl=51 time=36.9 ms
......
--- openwrt.org ping statistics ---
142 packets transmitted, 142 received, 0% packet loss, time 141186ms
rtt min/avg/max/mdev = 34.908/35.276/36.873/0.216 ms

traceroute openwrt.org

traceroute to openwrt.org (64.226.122.113), 64 hops max
  1   192.168.1.1  0,437ms  0,296ms  0,282ms 
  2   100.78.0.1  0,744ms  0,625ms  0,526ms 
  3   Provider address  0,856ms  0,805ms  0,788ms 
  4   Provider address  0,872ms  0,838ms  0,906ms 
  5   *  *  * 
  6   Provider address  1,308ms  1,005ms  1,049ms 
  7   178.18.224.159  35,502ms  35,188ms  35,029ms 
  8   138.197.250.138  33,255ms  *  33,152ms 
  9   *  *  * 
 10   *  *  * 
 11   *  *  * 
 12   64.226.122.113  36,600ms  35,359ms  35,386ms 

curl -Is https://dnsleaktest.com
curl -Is https://openwrt.org

Absolutely nothing is given, an empty conclusion

I apologize, I may have misunderstood you as my native language is not English. You asked why I mentioned Raspberry Pi5, right? In the description I described what I did before the main problem occurred, so that a detailed chronology of my actions can be seen.

That's fine, you need to tell us how everything is interconnected.

Google Drive

the forum allows images...

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
grafik
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall

Were those curl and traceroute commands issued on the router ?

As for the

[312370.201360] mt7530-mdio mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[312370.209489] br-lan: port 1(lan1) entered blocking state
[312370.214797] br-lan: port 1(lan1) entered forwarding state
[312370.955547] mt7530-mdio mdio-bus:1f lan1: Link is Down

Isn't it the wired computer starting and getting shut down ?

If this is the IP of the RPi5, and is set on the Xiaomi, it won't work.
Remove it, and use option 6, providing the IP, as in https://openwrt.org/docs/guide-user/base-system/dhcp_configuration#dhcp_options