Not sure what that could be. I've not had any experience with the BNETA plugs. Had a lot of disconnect issues with the BNETA bulbs in the past. Also had issues with tasmota devices and reserved IPs with some routers. I only use unifi nowadays. Or I disable dhcp on the router and run the home assistant add-on to reliably reserve IP addresses. Hope this helpsTasmota...whatever was current version a month ago.
They also don't seem to be obeying the static IPs assigned by the router reliably.
And all the other devices on the network are fine.
I've now tweaked two of the commands (SetOptions41 which is ARP, and set a static IP) on one of the plugs so will see if that makes a difference