DIAGNOSIS: You're hitting a known quirk of the U7K's processing. The 'Motion Clearness' or 'Motion Rate' settings can sometimes create inconsistent judder, especially with 24fps film content or fast camera pans in sports.
FIX: Go to Settings > Picture > Advanced Settings > Motion Settings. First, try setting 'Motion Clearness' to 'Off'. See if the natural motion looks better. If it's still jittery, try the 'Film' or 'Sports' preset mode—these often have the motion tuning dialed in better than the custom settings. If you want to fine-tune, set 'Judder Reduction' to 2 or 3 and 'Blur Reduction' to 1. This is usually the sweet spot for smoothing without the 'soap opera effect'.
IF THAT DIDN'T WORK: The issue might be your source. Check if the app or device you're using (like a cable box or streaming stick) is outputting a weird refresh rate. On the TV, press the 'Settings' button on the remote while watching and go to 'Picture' > 'Advanced Settings' to see the incoming signal resolution and Hz. For smooth sports, you want it to be 1080p or 4k at 60Hz.
HEADS UP: No setting will make low-bitrate streaming (like a poor YouTube TV connection) look perfect. The jitter might be in the source signal itself, which the TV can't fully fix.