No volume on iphone sometimes?

I've been having problems with the sound on my phone (4G) its temperamental with apps like youtube, IGN, and others. Never had any problem with any game apps. Its annoying because i don't have my headphones on me all the time so does anyone know about this or knows how to fix it?

Turn on assisting touch, you won't have to press the buttons so it might work abit better.

I don't know if you've tried this already, but double click your home button, swipe left twice and use the volume slider there, hope that this helps.

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