How to fix my HQ (iPhone 4s) on YouTube?

How to fix my HQ (iPhone 4s) on YouTube?

Added (1). If I use the YouTube app I downloaded, all the videos r grainy and it doesn't give me the option of an hq button, but it does if I use the mobile site. The app used to always play the videos just fine. How can I fix it?

Hi, i think you should extend your question a little. It is difficult to understand what the issue is. Give more details and ask a quesiton anew.

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