i'm facing an issue with the silent switch on my 8 plus. When the phone is in standby mode with the screen off, switching the silent switch to the silent position does not trigger the vibration feedback to indicate that the phone is in silent mode. The vibration is triggered only when the screen is on. This is useful for me as need to know if my phone is in silent mode when i flip the switch when the phone is in my pocket. My 6s does not have this problem