UPDATED 26/08: popped into SAMSUNG shop in Manchester Trafford centre today 26/08. explained the issue to the instore tech guy and also demonstrated the issue. happened first time (as described in earlier post), he suggested that the issues could be software or hardware related following the 6.1 upadte and that even if, as in my case, the phone is out of warranty, the issue would be rectified free of charge ( replace motherboard 🙄 ) as long as it is not consumer damage that has caused the issue.
He also said that the issue could be resolved with 6.1.1 or September security patch (whichever comes first)
Now I'm torn. live with the issue, as it is only the camera that is causing the issue, until later update or go for the repair in a hope they dont blag it as consumer damage and charge me a fortune.
hope this brings some enlightenment to the Samsung Masses with similar 6.1 related issues