Restart Windows if you haven't done so in a while, and then reboot your modem if it's a cable or DSL modem. According to my ISP's support documentation the DSL modem should be rebooted once per week.
is it all Youtube videos and any online streaming?
try a different browser, like Firefox, in case it's some sort of flash or HTML5 issue.
also check you have the latest flashplayer, available from here; fpdownload.macromedia.com/pub/flashplayer/latest/help/install_flash_player.exe
On youtube and online streaming, i tried with Internet Explorer, the problem still the same.
Restart Windows if you haven't done so in a while, and then reboot your modem if it's a cable or DSL modem. According to my ISP's support documentation the DSL modem should be rebooted once per week.
I already did this but it doesn't work
But it seems it work great again and I don't know why, i watched a video with the bug and 1 hour later, the problem has disappeared with no reason.