Android app only slow in wifi (every wifi)

[nic-nac]

Plan

Premium

Country

Germany

Device

(Sony Xperia XZ2 Compact H8324)

Operating System

(Android 9)

Hello,

My spotify app runs very slow, but only in wifi. And I am not talking only about my home wifi wehre I btw have 400 Mbit connection. I have the problem in EVERY wifi. When I start the app it takes a few minutes to load the start page, a nother two or three minutes when I want to go to my library, or playlist or whatever. When I disconnect from wifi and only use 4G it only takes a few seconds. I already tried everything I could think of. The problems already where there on my older Xperia Z1 compact. But I thought its probaply the hardware since this model is a little bit older. So the first thing I tried on the brand new one was the spotify app and the problem is still the same...