Sound on my iphone won't work?

This morning i woke up and i tried to listen to a song and when i went to turn the volume up, the little circle thing was gone. Every now and then it will come back but itll only stay for a few minutes. I can't really use my phone if i can't hear when i get texts and calls and i can't listen to music or have my phone on speaker and its just a big inconvenience and a lil annoying. Why is it doing this and how can i change it back to normal?

Try to reboot your device, or, go to the genius bar in any apple store and tell them about your problem!

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