Is there a way to lock the screen aspecially while running? Or may be add more protection for Quit traning option, so the training will not be aborted in the middle of it?
You already ran all the distance… and then, nothing recorded.
Happened many times to me…
I’m going to assume you’re using an Android device 
You really need to disable any power saving mode, i.e. when using the Freeletics app to track a run, put your phone on the highest performance setting available.
Same issue here, but having disabled power saving mode does not help. If the screen goes dark (after 10 min is the max setting ) the workout freezes. Only way forward is to restart the entire workout!
You should ask for permission “prevent phone from sleeping” so that I could enable that?