SD Connect C4 DoIP - wireless problem

Hello, everyone!
I bought SD Connect C4 DoIP which has WIFI, but when I'm trying to use it via WIFI the connection is unstable, and has been disconected many time.

If I'm using it with LAN there is no problem.

Tested on:
Lenovo T440
Windows 10 + Xentry 09/2023
Windows 11 + Xentry 12/2021

After a report to the seller, a device was replaced, which was probably defective.

After running a ping to the IP of the SD Connect C4 there was a lot of packet loss.