I'm using a new phone - Huawei P9 - for a few weeks now, and in general kdeconnect works perfectly with it.

But as I noticed now, the KDE systray icon disappears a few minutes after the phone's screen turns inactive (black screen).
If I try to activate kdeconnect by clicking the now hidden systray icon, it says the device is not connected.

As soon as I press the on/off button on the phone, so that lock screen appears, the systray icon shows up again and I can access the phone as usual.

This behaviour only happens with the Huawei phone. I have 2 other Android devices (Sony Xperia Z3 Compact and an Asus tablet), and both are reachable from desktop even when the screens are locked (what makes sense - how else should I try to use the "find my phone"-function for example?).

The kdeconnect settings on all Android devices look alike, so do the settings for kdeconnect on 2 different desktops (at the office, where I only use the Huawei along with kdeconnect, and at home, where all 3 Android devices are active along with my laptop's desktop - here the systray icon keeps visible, but the overview shows only the 2 other devices once the Huawei's screen turns inactive).

The new phone runs Android 7.0, the other devices 6.0.x, so maybe I'm missing a certain setting phonewise...?
Can someone help? Maybe I'm missing the forest because of a tree.

Sorry, it seems that I only had to restart my phone - didn't think of that...