That's a feature that turned On in your phone in regards to using less Data by stopping background usage and lets apps use less data in the foreground etc.
Its called Data Saver.
You'll find it in Settings > Connections > Data usage > Data saver.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "