Cell phone problem with WLAN?

Maybe someone has an idea.

My Huawei P30 smartphone was being repaired this week due to display damage. It was repaired directly in a certified workshop. Display works as it should, but since the repair I have problems with the Wi-Fi. The WLAN only stays connected within a radius of 2 meters from the router, further away it loses the connection. The message "Error in network connection" appears. It works fine within the 2 meters. I tested it with 4 different WLAN networks (with friends and different cities) the same situation everywhere. Connection only within 2 meters, as soon as I leave the area, it finds the Wi-Fi, but the error message appears, see above.

Here are the photos, the error message and that I'm connected to the same network.

Factory remainder was tried 3 times, not successful, could it be a defective WLAN adapter in the smartphone that was damaged during the repair?

Connected here

Now the picture with 3 meters away from the router - ->

I had such a problem once. Now I know what it was. It was probably the workshop that installed a new battery shortly before (if there was an iPhone I wasn't allowed to install the battery myself --- but although the workshop did it, they probably broke something)

It could well be that the WLAN antennas were damaged or not connected at all when the display was replaced.

You will have to send it in for repairs again.