This is a personal viwe ! App Lounge is capable of timing out, sometimes the user is informed, but also I believe it can time out silently. Speculation, this may happen when the servers are “busy”.
I believe we get a clue to this possibility when opening App Lounge. We often first see an animated blank screen. If this lasts for as much as 15 seconds I tend to go away and “try again later”.
It is possible that a “part download” could be stuck on your device. To clear this possibility
Settings > Apps and notifications > Show all … apps > App Lounge > Storage & cache > Clear storage | Clear cache.
Note any logins will be cleared / reset with Clear storage.