Norton Family blocks all Apps on Samsung Galaxy S5 neo Android 5.1

I defined time slots for each day for usage of the mobile phone (a Samsung Galaxy S5 neo, Android 5.1) for my son. The result is, that the startup of each App leads to an error message in German: "Oberfläche ist blockiert durch Norton Family", translation to English:  "User interface is blocked by Norton Family" when time slot is exceeded.

I would expect that only internet access for all apps is blocked, but not the complete mobile phone, especially Apps that don't use Internet access like MP3 player should still be working and not being blocked.

I have the NF Family Premier license bought. But this bug is blocking the correct usage of NF .