Phone killing any app on background
I have two Max Shot (they are basically a M2 Plus with one more camera, they even use the same firmware).
One of them has android 8 and the other android 9, the android 8 works perfectly but the android 9 always kills every single app soon after I open another app, sometimes just by pressing the middle button the app is already killed.
I tried everything, but nothing works. Oh and their android is close to a pure android, so no asus management or something like that.