I think ultimately this is a hardware issue, so it will need to go in for repair, however, tech support will ask you to do a factory reset first to rule out any OS conflicts, so you may as well try it and then if no good approach Samsung. They will usually send you a jiffy bag to send it in to their service centre.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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