Streaming through Chromecast stops when opening the Plex app

Plex Players
1

Server Version#: Latest Plex version on UNRAID
Player Version#: Chromecast and NVIDIA SHIELD

When I am casting my local music through Plex or even casting from my Spotify app, the music plays flawlessly.

When I open my plex app after a while, the music playback stops on my device and I have to recast to my device and start the music again.

Is this a bug ? or by design.

Thank you. HP.

2

Closing here and posting in GENERAL DISCUSSIONS section for visibility and help.