2 light Vertical lines appeared...

Hi.
After a few months, 2 vertical lines (multicolour but very light, not easy to be seen or recognised) appeared on my ipad 3 at about 1cm from each side.
At first I was thinking it was a kind of pixel issue close to the long size sides, but I noticed that by rotating my device 90°, the 2 lines appear at the same distance from the other 2 vertical sides, which are the shorter one... So nothing related to pixel or screen but looks like a software issue.
Is anybody experiencing the same issue?
Thanks, cheers

...correction...as regarding the 90° rotation... They are present at about 1cm from each side, so they are 4 lines in total...

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2 light Vertical lines appeared...

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