[BUG] Random 5GHz WiFi Drop on Xiaomi MiWiFi Mini (ramips/mt7620) and Xiaomi mt7621 Routers with OpenWrt 24.10

Installing and Using OpenWrt
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Hi. I’m experiencing a very frustrating issue with my Xiaomi MiWiFi Mini (mt7620) running OpenWrt 24.10. The 5GHz WiFi signal randomly disappears without any apparent reason. This also occurs on some of my Xiaomi mt7621-based routers.

The issue seems to be triggered when downloading large files (e.g., a 10GB file from HuggingFace), but it can also happen even during light usage like checking emails.

What’s even more strange: sometimes the internet connection is lost (no external ping response via LuCI), but the 5GHz WiFi SSID is still visible and connected — just no internet access. This makes troubleshooting very difficult. Restarting the radio interface via LuCI doesn’t help — even after restarting the WiFi radio, the 5GHz SSID remains down until a full reboot of the device.

After struggling with this issue for weeks, I rolled back to OpenWrt 23.05.5, and everything has been stable ever since. I think OpenWrt 24.10 might be the worst release I’ve used so far — I really miss the stability of LEDE 17.01 or OpenWrt 19.07, or at least the reliability of OpenWrt 23.05. I really hope the OpenWrt team can implement a stronger Quality Control (QC) process before releasing new major versions.

I really hope this issue can be fixed soon in a new update. A stable WiFi connection should be the top priority. I would like to see some releases like LEDE 17 come back in the next OpenWrt 25.

Thank u./.

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thank you for volunteering, please provide an email address to be added to the testers mailing list.
hope you own all the devices supported by OpenWRT, to be able to do proper pre release end to end tests.

I wouldn't hold my breath.

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So make ssids in both bands identically named and you will have all diagnostics on your desk.
Get some logs around 5ghz disappearing?

Symptom looks like DFS signal, probably wrongly implemented in old code.

Please produce output of

ubus call system board
cat /etc/config/wireless

from both devices, replace secrets with ABC

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Can you wire up the serial connection to grab the terminal log.
What type of internet connection do you have, Wisp, DHCP, PPPoE, Static?
One thing that is apparent, is that all ports are 100Mbps except the CPU port 6, which shows as 1Gbps.
Do you have the correct country code set for the 5GHz radio.

Which other Xiaomi routers do you have this issue with?

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This issue exists at least half a year.
Maybe it won't be fixed.

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One of affected ppl has to share log lines and configs. At least 7621 in general are rock solid, with diminishing usefulness of FE gear in other case.

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Yes 24.10 has been around for half a year.
Without logs or configuration for the same thing to be recreated by several people it's unlikely to be fixed anytime soon.

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I do see this with windows and the intel wifi card 7260 & 7265
but updating the laptops wifi card fixed it
I'm sure it's due to lintel not updating legacy products
at one pint I could downgrade the drivers and it worked ok
but then this driver would not connect to an access point with WPA3 avalabe

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