Why is my video glitching?

Hello! I've got an issue with my Nikon D3500. I recorded a video on it, and when I playbacked it after recording it was fine. Then, when I downloaded it on my computer, it has 5 seconds of glitch in it. I opened it with multiple video players, with editing software, same result. I recorded with it before and after this incident and no problems appeared, it's only this one video. I couldn't find an answer anywhere. Maybe you can help me? Thanks a lot!