My iPhone won't let me watch anything?

I was watching something on YouTube and wanted to watch something else so I pressed another video and it was just black with the spinning circle I waited for a very long time, and everything I wanted to watch did the same thing and I thought it was my Wi-Fi, but I can still go on the internet just can't watch any videos, it's the same with Netflix, so I'm just wondering what this is or how I can fix it. Any ideas?

Reboot your ipHone or delete Safari History and cookies

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