If you are behind a slow connection, you must have encountered this problem that whenever you toggle full screen, Youtube deletes video buffer and it starts streaming all over again. This is not any bug but actually a feature of Youtube.
Why does it happen?
Youtube deletes buffer and starts streaming it again because videos at 240p or 360p resolution do not offer enough quality to be shown in full screen. So they automatically switch to 480p, resulting in the need to re-stream the video.
How to solve it?
Step 2: Select the option – “I have a slow connection. Never play higher-quality video.” as shown :
And you’re done. Make sure you’re always logged in. If this problem still persists, let me know by leaving a comment after this article.