Volumio App annoying

Hi guys,
I have the Volumio Primo Hifi, bought an Sbooster with a good power cord and fuse and enjoy browsing through the classic collection of Qobuz. Small criticism, however. Since the update to Volumio 3, the app has neither worked properly on the iPhone XS nor on the Macbook m1. The upgrade to the new Fritzbox 7590 AX, which actually sounds better than the old 7490, didn’t help either. The app stumbles through the “my albums” or favorites list. It works perfectly on safari. Please have a look at the app. Thank you Dirk