WLAN very slowly with P20 Pro?

I have. Yesterday I bought the Huawei P20 Pro and I'm also very satisfied.

However, that is. I noticed that the WLAN connects but works very slowly.

At 5 GHz, it receives no reception, because the router is far away and is forwarded only with the repeater.

At 2.4 GHz, nothing works.

Someone an idea?

Maybe restart the router so pull out power and reinstecken again I think rather not that s.den your P20 pro. PS: awesome cellphone.