Some Plex team members suggest keeping the download screen open during this process, though I usually stream a video on Plex while downloading media, as this keeps the phone unlocked. Leave the Plex app open while downloading media, and don’t lock your screen. Leave the Plex App Open: Unlike Hulu and other streaming apps, Plex has a hard time performing background tasks, especially on iOS.I also suggest updating the firmware on your smartphone or tablet, as recent changes to iOS and Android may improve Plex behavior. Open and click the “Activity” button in the top right corner of the interface-if an update is available, it will tell you so. Update Your Plex Media Server: It’s easy to fall behind on Plex updates and bug fixes.