this usually happens to me whenever my network has some sort of issue, try to either restart your modem and if that doesn't work then try to restart mc, if that STILL doesn't work, restarting your pc may fix it. Hope any of these tips work for you!
nice vid! I was honestly just wondering, what type of mic is that? Or are you replicating the keyboard sounds with software? Because there's 0 background noise and you can't even hear the mouse (also the keyboard sound very weird, like if the audio is cut)