Iphone 4 has got grey lines on screen?

About 5 days ago grey flickery lines appeared across my iphone screen and the top and bottom of the screen turned a grey colour by after about 10 minuets they disappeared and my screen went back to normal, the same has happened today but my screen is still like this, I know it isn't a problem with my screen as it resolved itself the other week and no I haven't dropped it or got water in it, I searched for help on google and someone said to hold the volume button, home button and top button all at once and it should resolve the problem but my home button is broke I'm using the assitive touch home button which is on my screen, does anyone have any suggestions thanks

A minuet is an 18th century dance.

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