F-Droid doesn't show the apps to download

• Device OS and version: Android 7.1.2
• Device model/manufacturer: Fairphone 2
• F-Droid version (in the About screen): 1.6.2
• F-Droid privileged extension version (if installed):

What did you do? (clear steps if possible)

I installed the app two days ago. After that in the evening I got a message for an update. But in the evening the update failed. I tried several times. The next day the update succeeded. After the update all the apps could be shown. Today I wantedt to install some apps from f-droid, but I could not see any apps. Message on the screen:

Keine kürzlich aktualisierten Apps gefunden. Vor 2 Tagen aktualisiert.

I even cannot serch for an app, f.i. blokada. The answer is: Keine passenden Apps verfügbar

What did you expect to see? All apps, that arre offered by f-droid

What did you see instead? Keine kürzlich aktualisierten Apps gefunden.

Vor 2 Tagen aktualisiert.

I installed the app on my tablet (Huawei MediaPad M5), there it works fine.