Why can't I play any videos on my iPhone 6?

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I can't watching any video related things on my iPhone like YouTube and it happened right after I finished one of the videos on YouTube.

Youtube won't play any videos on my iPhone? It might be because of ios8 but with standard youtube app, I used to be able to watch youtube videos. One day, it simply didn't work. It loads for a long time, then an error message that reads "Can't play video, please try again later" can anyone help?
Why can't i play youtube videos in background/lock screen on my iphone anymore? I always used to be able to do this, is there any way to still do it? Or is there any way to get an older version of the app that will alow me to do it? And does anyone know why they stopped this function? Very frustrating!
Why can't my iPhone play my recorded videos? I recorded some videos this morning and I can't see them. It's just a white square. I'm assuming it's because my storage was full. I freed up some space but I still can't see them. Is there anything I can do about this?
Why can't my iPhone 5c play videos properly? I just recently got my iPhone 5c a little over a month ago. It was working fine within the first couple weeks, then I began experiencing difficulties watching videos. I can't watch a single video without it constantly pausing on its own & freezing. It becomes very frustrating. In always connected to Wi-Fi so I'm wondering why I'm always having this problem? I've tried turning my phone off but that never helps. Any help would be greatly appreciated!