What shield do you have pro or tube? Is your shield on wifi or ethernet?
Most likely it’s a bitrate issue, the file size was 54gb+, not sure if the Chromecast is powerful enough to play remuxes. I own Shield Pros, so I’ve never had these issues.
If Chromecast on wifi, then an adapter may help, but again if bitrate is too high it might not.
Serious question. Are these apps just for people who don't own local storage? Like why stream from sketchy sources that are unreliable vs setting up sabnzbd and a NAS?
Try putting your Nvidia Shield in the same location and see if the issue might be the strength of your wifi.
Looks to me like a WiFi traffic problem.
Most likely it's your source u are getting from cinema HD. Consider gettiing a real debrid account it will take that app to a new level. You get what you get for free
Edit: I'm using real-debrid and there is nothing wrong with the app itself, as it is working fine on my Nvidia Shield but continues to buffer/freeze on the Chromecast.