[FS#3889] Loss of connection every 2 sec on 100Mbps cable

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Vladislav (NitroOxid) 

Attached to Project - OpenWrt/LEDE Project
Summary - Loss of connection every 2 sec on 100Mbps cable
Task Type - Bug Report
Category - Other
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - i have a Xiaomi Mi Router 3G (gigabyte) router, installed openwrt four years ago from source, it had issue - in lan the network would re-connect once 1-2 secs (dont know about WAN). it was impossible to use, i changed to another firmware, not openwrt

time passed, my lan upgraded to gigabyte cables, i compiled openwrt again, the re-connections were no longer an issue! it was ok.

Then i noticed these re-connections appeared suddenly in vmware in bridge mode.

Then more: if i connect to router, i can even use unmanaged switch (mercusys ms108g) clients with 100Mbit cable, then the device starts having these re-connects again. gigabyte clients don't have this issue.

Then i noticed that ethernet device it can be with 100Mbit network card, but the cable is gigabyte - the issue also disappears. I thought it is a bug in drivers for a long time.

But today I found one firmware at github, a fork, https://github.com/coolsnowwolf/lede compiled it, installed. Connected device with 100Mbit cable, waited 40 mins, disconnects are missing. in vmware they're also absent.
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Hope this can be fixed in openwrt
The problem is observed on versions: 18.06 - present (21.02), and nightly.

I'm ready to be a tester, provide any logs, and flashing the router in testing the fix.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3889

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