The only way to check for sure if it's hardware or software is to do a factory reset (which will remove all your apps). Try the camera without adding any apps and see if it works. If it does it confirms that you have an app that is giving you the issue. If it still doesn't work it's a hardware issue which will need to go back to Samsung for repair.
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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