IPhone 4 issues, sound, camera, mute button

Are these common issues: 3 months ago I had no sound coming from the speakers which fixed its self. Occasionally my camera screen goes black and only works if I leave it for 30 mins. Now when I tap the side the mute switches on and off and goes crazy. Are these common faults or should I seek manufactures warranty as only had the phone for 5 months.

Get it refurbished

I've not heard of it before, but either way it's a fault, contact the supplier/network that provided the phone and have it looked at under warranty.

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