Youtube and videos keep downloading so that the lecture stops and goes on by "increments"each 2 seconds

Youtube and videos are not running fluently the way they did.  It goes on downloading each 2 seconds. What can I do to solve the issue ? Thank you for your help.

Most YouTube content requires the Flash plugin. Sometimes it's necessary to uninstall then reinstall that plugin.
Uninstall the Flash plugin then reinstall new >  Troubleshoot Flash Player | Mac OS
Very important to uninstall the currently installed plugin first.
Now launch Safari and try a video.
If you have the ClickToFlash extension installed, that can prevent Flash based video from streaming. It can also be installed as a plugin in /Library/Internet-Plug-Ins.
And check to see if Safari is running in 32 bit mode. Right or control click the Safari icon in your Applications folder then click Get Info. If the box next to:  Open in 32 bit mode  is selected, deselect, quit then relaunch Safari.
You may also need to delete the cache associated with Safari .
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy/paste:   ~/Library/Caches/com.apple.Safari
Click Go the move the Cache.db file from the com.apple.Safari folder to the Trash.
Quit and relaunch Safari. Try a video.

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