Hi,
After some research I am narrowing this down to possible loose flex cables in within the phone. But I cannot be sure! I chat with Apple the other day and asked if I could get it swapped they said but my phone is now 15 months old. I have asked about consumer law which would cover me but they said it really depends. I have not had any drops or water damage. But something tells me this may be software related? Please check out the video http://tinypic.com/r/2usernd/9 as well as the image included below.
Please if anyone could shed some light that would be brilliant!