A faster card may not solve this. If an SD card is truly too slow, cameras usually stop recording rather than record “missing” frames.

First, check where the problem appears:

• If playback is smooth in-camera but jerky on your computer, the issue is likely playback performance, card reader speed, or another computer bottleneck.
• If it also looks jerky in-camera, the cause may be the camera’s video processing/encoding under certain shooting conditions rather than the card.

Some users report this happening when exposure changes quickly, such as moving between dark and bright scenes, possibly because automatic ISO/exposure adjustments put extra load on the camera.

What to try:

• Play the clip back in-camera.
• Copy the file to your computer’s drive before testing playback.
• Try a different scene and see whether it happens consistently.
• Reduce fast exposure changes, or avoid auto settings during video if possible.

A faster SD card is still a reasonable test, but based on the reported behavior, the card is not the most likely cause unless recording actually stops or errors out.