There are two versions of the Roku 3: the 4200 (Mar 2013) and 4230 (Apr 2015), so depending on the version yours is either 9 or 11 years old. While both are still officially supported, it's certainly possible the player simply can't handle the demands of that screensaver. The user interface only supports 1280X720 resolution, and that might simply not be enough for that screensaver.
I wouldn't be surprised if Roku finally moves both of those models to the legacy list and drop support. It has to be more work to still maintain the OS for that old of hardware.
Dan
Roku Community Streaming Expert
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