This may be caused by a corrupted memory cache.
Try restarting the Roku to clear the cache. Depending on your Roku model and Roku version number you'll find the "System restart" option under "Settings > System > Power" or if you have no Power option, under "Settings > System".
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X