Can't record/ play recorded videos in iphone?

I have an iphone 6s. I used to be able to record as much as I wanted to, but a couple weeks ago when I was recording something, my phone just stopped recording for me and everytime I would press the record button it would stop the video immediately. I have no idea what is going on!
Usually it only records 2-4 minutes. And when i go play the video it tells me that the file is not supported? So when i click "more info" it sends me to the Apple support about how to fix it on your Mac… But this is my phone i'm talking about! It's not a computer. I try shutting it down but that hasn't worked.
P.S: I have a lot of storage on my phone so I know that is not the problem.
Anyone know what to do? Or have the same problem?

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