Roku's 9.3 update ruined smooth action settings on my TCL 65r617, though setting is "OFF", smooth action is engaged across channels, inputs and apps, other settings, such as temperature, can't be adjusted either. A system restart solves it temporarily until you switch inputs, apps or tirn tv off and on again. Fix the **bleep** issue you created with the update.
9.3 has been out for a long time. Sure it wasn't 9.4 which is rolling out now?