I too had a Samsung tv with 3 purple patches on the screen after owning it for 3 years. I had taken out an extended warranty with Currys knowhow, and contacted them to collect to have a look at. After 4 days it said on the Knowhow website that it had been repaired and would be delivered back to me the following day. After reading most of the forums on this topic, I thought that this was a mistake so I gave them a ring to ask what they had done. They told me that they had put a new screen in (not panel) and updated the software. Anyway the tv arrived the following day 28/02/18, and to my surprise it was perfect, so I don't know if this is the fix to the purple patch syndrome!
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