Maybe I’m just an old cynic, but when someone says: “move along folks, there’s nothing to see here”, there usually is. Seems to me that “Nothing” in this case, is a pretty insulting way to snake out of taking any ownership for the issue of Back-Button crashing. And if this actually fixes it, its aboot time. Bad Tablo, get down boy. Go in your house.
Indeed, there is a minor bug on the Roku app that occurs when the back button is pressed once you resume from the screensaver. Unfortunately, this occurred as a result of a Roku OS update.
Try disabling the screensaver in the Roku settings as a workaround for the time being, and that should resolve the issue.