If the problem is only when playing streamed video content from the web (such as YouTube videos), try using a different web browser. If the problem then disappears, go back to your original browser and clear its cache. If that doesn't fix the problem, reset the browser to its 'out of the box' settings. (If you need instructions, please tell us which web browser you're using).
If the problem is present beyond only when playing streamed videos (such as when playing downloaded videos with VLC), start here:
https://support.microsoft.com/en-us/windows/fix-sound-problems-in-windows-10-73025246-b61c-40fb-671a-2535c7cd56c8
In particular, try running the Audio Troubleshooter (Section 2 in the link).
If that doesn't work, try updating the audio driver. (That the first bit in Section 6). However it's likely that you'll be told that you're already using the latest driver. If so . . .
Remove the audio driver and then restart the laptop. The driver will be reinstalled automatically. (That's the next bit of Section 6).