With URC 980's, I've experienced the exact same problem (excessive repeating of the "joystick" functions) on all of the new 2016 Roku models, including the Ultra, Premier+, etc. After trying the URC library codes, which have always worked perfectly on previous Roku models, I've also tried 4 or 5 sets of hex codes I found various places online (including RC.com) and all of them have the same problem.
After some testing, I did initially conclude that turning off the "repeat while pressed" function in the MX-980 was a good work-around, but I later discovered that in certain Roku screens, like the Search screen, the problem was still there even though the MX-980 repeats were turned off. Of course, turning off the repeats also prevents the user from pressing and holding the joystick to "scroll" horizontally or vertically. However, I was willing to accept that limitation as a trade-off if my work-around prevented the excessive repeating of the joystick functions.
After the report from my client that the Search screen is still exhibiting the problem, I guess my work-around didn't work after all.
Can someone (Roku?) please provide a revised set of IR codes for the 2016 Roku models?
