The I4S is frequently hanging when a call is received after updating the Sw to version 8

After updating the Phone Software to version 8 the Instrument I4S hangs frequently when a call is received. You can see who is calling but the touch screen does not respond and only way is to switch off and on.

Make sure that you don't have the Do Not Disturb mode enabled in your device.
Use Control Center and verify that the Moon icon is greyed (not white).
Check as well in Settings > Do Not Disturb > Manual and Scheduled is turned off

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