Thanks for all the posting on the stuttering picture issue...
...I also purchased both Roku Ultra and SE on Black Friday. Was very excited to hook up and try out Ultra, a major upgrade from the Roku XS refurb I have been using for years.
All with Ultra was great and quick, until today when I tuned it to ESPN for CFP Semi's, both on ESPN. Stuttering of picture has been creeping in, most times constant, with live action mainly, a bit on replays, and even on a few commercials.
My Ultra has the 9.0 OS...and I tried numerous settings adjustments, including the suggested Auto Adjust Display Refresh Rate enabled setting, that is factory set to disabled.
Changing the setting made a difference for a short while, but soon made no difference in stopping the picture stutter.
Must admit that I have the lowest level on ISP, only around 3 mb, but I have not experienced stutter on other channels such as Hulu, Pluto, etc...
I have experienced a much slower stutter on ESPN using the Roku XS, more like a 1-2 second pause, then 4 second play, pause...play...which I could most times get rid of by restarting the ESPN app. And XS would sometimes stutter, and then reboot, but usually only with the ESPN channel live broadcasts.
Hoping the fix is another firmware upgrade, not in the hardware....but it is annoying enough to make an otherwise nice Roku Ultra streamer returnable for refund, along with the Roku SE I have not set up yet.
Stutter has annoyed me enough to start googling and brought me to this forum, to follow, and post my experience hoping Roku is listening and working on it.