I would recommend the application WiFi Auto! If your battery in the device becomes exhausted quickly as possible, that the cause is the WiFi module. The device uses a battery to maintain the connection over WiFi even when the screen is off. This application is best suited to automatically turn on WiFi when the screen is unlocked. And turn off WiFi when the screen is locked.
This application is completely secure to download. Cygnus Software is the creator of the app that can be found in the Tools category. According to the latest data, Wifi Auto PRO is rated 4.4 on Google Play.
Over 1K users downloaded and installed this application and the latest release was on Oct 11, 2020. Download the installer of Wifi Auto PRO 2.30.2 free of charge and have a look at users' reviews on Droid Informer. The app works flawlessly on Android 4.1 and higher.