Bug (i believe) with the Remote Lab app

After some minutes of afk time (no input), the phone touch gets disabled, i can’t press anything, but i can close/open apps using the manager, and i can see them opening/closing, without being able to interact with the phone.
To fix this i have to exit and join again the reservation, by losing all the progress i made in the last session.
Is this a bug or there is an afk time?