Plex keeps popping up the controls over and over
We normally watch shows by streaming from plex media server to our Chromecast via the Plex android app. Somewhat recently (last couple months?) it has started consistently popping up the controls for apparently no reason while we are watching. We don't watch on the web player that often, but it happens there as well. It just pops up the controls/poster/progress bar for a couple seconds and then it disappears again.
At its worst, it's done this 10+ times in a row every 30 seconds.
Any idea what's going on here?