Constantly logging in to Android App

[thule]

It might occur only with older android devices as I said below.
Or have you found a solution so far?

Android 3.12.0 doesn't save my user / login

Hello, could you solve this? This happens to me with my older android device but not with a newer one. So it looks like with older phones, this is just how it is. I have not found another explanation either.