How to get my Instagram video to work?

I've had Instagram for a while now with the video feature on it. I've posted many videos but ever since Thursday (2 days ago) my Instagram video hasn't been working. I can record and post videos fine but the sound feature just doesn't work, when I play my video it is muted. There's nothing wrong with my sound on my iphone or my microphone, any suggestions?

How about uninstalling instagram and installing it back again? Hope that works. It usually is a really good app~

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