Hi altan.pinar95,
Good day.
(1.)
Could you kindly tell me more about the adaptive brightness problem?
(2.)
Sorry, I got some confusion about this "notification buzz is buzzing when there is no notification"
Could you show me a short video and which app that you use?
(3.) losing wifi connection often
Does this problem appear if you connect to another router?
I would suggest you forget the WiFi SSID and re-connect again.
If this problem still appears, please reset the network settings.
( settings > system > reset options > reset WiFi, mobile & Bluetooth)
(4.) Do you mean your device still receive WhatsApp notification sound even on vibration mode?
Please kindly help me to check the sounds & notification setup in phone settings.
Thank you.