[FS#762] TP-Link WR1043ND v4: Network on switch fails at random

[LEDE Bugs]

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FS#762 - TP-Link WR1043ND v4: Network on switch fails at random
User who did this - Werner Slabon (WernerSlabon)

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I have a lot of tp-wr1043nd in large network running (all version up to v5).
On 06.12. all v4 and v5 (the first and only was installed on 11.12.) began to show the described problems.
I‘m not aware of whatever has changed on this day - the v4 were running since April/May without any problems (they are monitored with PRTG).
Yesterday I added a small ping script (on two devices) which is restarting the network if the ping fails. The log shows that the failure occurs 5-6 times a day, One one device 3-4 times within 1 hour, the other device in period of several hours.

All devices are located in “server“ VLAN, another VLAN is configured for the switch ports and then 2-3 WLAN/VLAN are configured for WiFi (internal employee, guests and youth/children).
The devices only have an IP in the server network, all others VLANs have an unmanaged bridge interface or no interface (VLAN on switch only).
There‘re operating as pure AccessPoints - no WAN, no DHCP-Server and are DHCP-clients.

They are running on OpenWrt and LEDE (the latter because of v5 support and the current two I‘m observing currently)

Is there anything I can collect?
E.g. capture packets in a ring buffer?

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=762#comment3995