
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 1: Login to your account (or Register if you don’t have one). Then open your Playback Setup in your Account Settings :-
http://www.youtube.com/account_playback
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.
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I have a fast internet connection – fiber-optic cable. But YouTube still buffers or plays out of sync in full-screen mode, but not in any of the smaller modes. Any tips? Is there some way to allocate more RAM to streaming, or is that not the problem?
I have a slow connection, im not in full screen mode while watching videos on youtube. The video streams midway and starts buffering again (not an issue) because its not finished completely. If i drag it back to the start to watch the video again from the beginning then it starts buffering from the start as well.
Appreciate you helping me out with this issue. Ive heard this is a problem on all HTC phones and iphone does not have this problem.
By the way, im trying to do this on the HTC One X…..kinda missed tht out.