Hi Ilse and welcome.
it is recommended to share device-specific details when raising issues:
When related to System-Updates, there is always a version-specific thread for issues etc.
Are you referring to App Lounge?
Does sometimes not work reliably for me either and most of the time, therefore I recommend to use F-Droid for FOSS-Apps and Aurora Store for GPS-Apps.
You can install the latter via F-Droid.