Wifi power save mode in marshmallow

Hi i have problem with note 4 n910h marshamallow.my wifi is constantly connect and disconnect with freezing upon it and sometimes reboot itself. In lollipop i have fixed it with turn off the wifi power save mode in service menu (*#0011#) but i cant find such wifi power save option in marshmallow service menu , can u guys help me?its kinda frustating

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