Snapchat Audio not working correctly on iPhone?

Hello So i just got a new iPhone today and downloaded snapchat. I signed and everything was fine. Then whenever I try to watch videos the audio does not work, UNLESS, i turn up/down the volume manually everytime for every video. This is rather annoying, does anyone know how to fix this?

Reinstall the software on your iPhone and it should work properly. The software on the iPhone often gets these kind of glitches.

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