After the camera recorded the video, it punched in the computer for the first time, and it was fine for the second time. What happened?

Connect the camera directly to read the video from the camera and play it, or copy it to the computer and play it again?

If so, that's normal, because the first broadcast will generate caches, and when the second broadcast will read these caches, it will naturally not get stuck;

Generally, copying the video to the computer and playing it will not get stuck. Except for dances with high bit rate, for example, if the bit rate exceeds 15M, you will get stuck when playing on a general computer.