Do you just want a list of all the possible reasons and speculations or do you want to provide some details of the issue you are having?
Include the Roku model number found is Setting/System/About, your router model number, your ISP (internet service provider), and any error messages you may be seeing on the screen.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941