Hi, @discobole6894549d29 and @f449d2b01966c6d!
Just a bit of background here, our Chromecast integration currently works by sending your Chromecast device a URL to play. Once the URL is sent, the device can stream it, even if you aren’t in the room. Unfortunately, if you go to another app or lock your phone, Pocket Casts is unable to track your progress, which also affects playing your Up Next queue.
This is an issue we’re aware of. However, it will most likely have to be fixed by Google in the Google Cast SDK they provide to developers. We have raised the issue with them, and when an update is available, we’ll include it in our app.
In the meantime, a workaround would be to enable your Pocket Casts app’s “Keep Screen Awake” setting under Profile > Settings icon > General. I know this is probably not very ideal, but I hope it gives you something to consider!
Pocket Casts Forum 