I have four TL-WPA4220 v5((1.0.12 Build 230309 Rel.64136n (6985)) and threeTP-P4010 one v3(TL-PA4010(EU)V3_180914) and v4(TL-PA4010 KIT(EU)_V4_231103).

One of my TL-WPA4220 connected via Ethernet to a TL-MR6400 router.

All four TL-WPA4220 have DHCP disabled and all devices get DHCP from TL-MR6400.

When I use WiFi on the TP device (only supports 2.4g) I get duplicate packets between hosts running on the access points.

I see the DUP packets on a daily basic but sometimes devices drop and do not come back until a reboot.

I setup a monitoring server on a Raspberry pi

This causes some devices never to connect back until the AP in range is rebooted. We also seem the same thing across all 4 TL-WPA4220 in the same time range.

We have also downloaded the PLC utility and disabled power saving mode for the three TL-PA4010

Very close to this post but does not have a solution.

https://community.tp-link.com/en/home/forum/topic/506386