If you cannot watch movies on Rakuten TV from your Samsung Smart TV because they do not load, but you can watch trailers ok, try updating the version of firmware on your device.
The firmware is the software (or system) that controls how your device functions. Samsung regularly updates firmware versions in order to correct problems and introduce improvements. In some cases, however, we have detected that firmware versions are not automatically updated like they should be. It is likely that this is the cause of the problems you are having watching Rakuten TV content.
To solve this problem, we recommend that you visit this help page where we explain how to update your firmware version so you can continue enjoying Rakuten TV from your Samsung device: