How can i deactivate this option? I need some apps with permanent internet acceas. 4g not turning off, but wifi always doing it.
In android 7 there was a options under wifi menu, cant find it now on oreo
Not in Oreo. And yes, i want more battery usage sometimes.
Wi-Fi (and Bluetooth) should stay on all the time if enabled. The power drain is minimal, at least if the 'Open network notification' is turned off and 'Switch to mobile data automatically' is turned on.
The best power conserving option for my use is 'Do not disturb' mode, at 5% in 8 hours (overnight, on the table) with all radios, GPS, NFC etc. on.
My Nokia 6 had several annoying bugs after the Oreo update, with music playback stopping, Bluetooth turning itself off etc.
The only permanent solution was to factory reset the phone, then set it up fresh without restore of apps and data, and without automatically install my apps.
A less time consuming option, maybe worth a try in this case, also in Settings > Reset options = Reset Wi-Fi, mobile & Bluetooth
Keep Wi-Fi on is not an option that I can find in Android 8.1.