All of my Roku Express devices have a much slower reaction time in navigating within apps like Hulu than my brand new Roku Ultra. I bought the Ultra because I figured that this device might have more processing power and might perform better but I am wondering if it will degrade over time just like the Express devices did. What causes these devices to slow down over time? Can I somehow do a hard reset to them so that they begin to perform better? (I have already done many resets of the devices and it never makes a difference). This seems to be a major issue and should be addressed.