Plex-Chromecast eventual stutter?

I have a cartoons playlist that I use for my son. We stream Plex to our Chromecast. But once we get a few episodes in (between 5-10), the stream starts to stutter and freeze up, becoming unwatchable. Sometimes it freezes entirely.

To fix it, we have to stop playback, disconnect from the Chromecast, reconnect to the Chromecast, and then resume playback.

Any ideas why this might be? Let me know what info I need to provide to get help. Thanks!