Purple line down right side of screen on 3rd phone?

anon(10335182)

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Oct 10, 2017
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Just over a year ago I purchased a Samsung Galaxy S7 Edge, a few months later I noticed this annoying pixel thick purple line down the right side of the screen. I took the phone back and they replaced it as faulty, a few months later the same thing (replaiced again) and then it happened again and im now on my 3rd phone! This morning i again spotted that annoying purple line.

I very well caring with my phones and never throw, drop or scratch them. I must be doing something wrong but i cant for the life of me figure out what!?

Could anyone shed any light on why this happening please?