WLAN not working on smartphone?

The WLAN on my Huawei P30 has recently stopped working.

The connection very often switches to "No Internet access".

That goes away when I restart the WLAN on the cell phone and then comes right back.

I have already deleted the network settings on my cell phone, but nothing worked.

Has the Wi-Fi password been entered correctly?

Yes of course.

Try it right next to the router and then a few meters away. If there's no password problem, it can be a cell phone problem, in the cell phone there's something like an antenna for the WLAN, possibly broken.

Alternatively, try using another cell phone on your router to see if there's a problem with the router. Then it is usually a radio problem, a new neighbor called in who uses the same frequency and disturbs yours. Then it's just a matter of setting the router

Restart the router, done already?

Otherwise there are plausible hints here:

https://blog.deinhandy.de/wlan-mit-ausrufezeichen-so-loest-du-internetprobleme-beim-handy

PS:

Possibly. Try switching off Bluetooth on the smartphone, sometimes (depending on the smartphone) the 2.4 GHz WLAN interferes.