I see other post with the same problem (Nightbot BETA downloadable client tabs out CS:GO when it switches song (AutoDJ)) but the App continue with the problem.
When the App change to the next song, a window is opened during less than one second, this causes the problem.
With the version 0.0.1 of the App I don’t have this problem but I have other problem (the music freezes every 5-10 seconds)
I can’t use windowed mode for the game because this worsens the performance of the game and I don’t use the website because I want skip the song with my keyboard.
I hope this is taken into account and solved in future versions, thanks for your support.