Spotify with iPhone X and Wlan Trouble

[manuGUN]

Hello,

For a few weaks or month i have these problem:

When i start Spotify on my iPhoneX with Wlan Connection there is only the load screen or it shows the screen that Spotify is "offline". I cant search to new songs. I can only play offline music.

Sometimes when i try to restart Spotify, connection is up for 1-2 seconds and i can start a song but connection lost after a few seconds again.

Here some infos what did i try:

-checked internet connection with Wlan on my iPhone X (e.g. Youtube works fine)

-Spotify and iOS is up to date

-Spotify works fine with mobile data with 3G

-On my old iphone 5, connection is up too on the same Wlan

-Spotify works fine on my PC with Lan

-i have reinstalled Spotify on my iPhone X

-i have restart and reset the FritzBox

any ideas what can i try to solve this issue?