Hello there! I am Charity, I'm an Independent Advisor. I'm glad to help you today!
My apologies about that. May I ask what is the make and model of your earphones? May I also ask if you're using a desktop or a laptop? Does this also happen on other devices, like on mobile phone?
Sometimes, a corrupted cache can cause issues with video playback. Clear your browser's cache and cookies and then try watching YouTube videos again.
Please let me know if this worked for you.
Kind Regards,
Charity