WiFi goes to sleep when device asleep

On my Samsung Galaxy S7, whenever the device goes to sleep, the Wifi goes to sleep as well. Meaning: * If I'm connected to a WiFi network and the device is idle for about 10 minutes (tested it), the device won't be connected to the WiFi network anymore (ping is unreachable) * If entering a WiFi network area and device is idle, it won't connect to the network until I turn on the device manually. *There are exceptions:* * While charging * When disabling deviceidle option via adb (adb shell dumpsys deviceidle disable), the problem is the option is reset after reboot *What I've checked so far ?* * Different Wifi networks * All 'Keep WiFi on during sleep' options * All 'Smart network switch' options * Setting my router to specific channel and not auto * Manually disabling almost all possible apps under 'doze' option * An app to 'keep the device alive' IMHO, as disabling 'deviceidle' actually fixes the issue (until next reboot), it's some kind of a bug in Android which tries to optimize the WiFi process, but, I hope someone proves me wrong.