Samsung s7 Two-thirds of the Screen Goes Black When Phone Is Cold

[At This Moment At This Moment]

Hi,

Quite a few people online say they have the below fault.

When my Samsung s7 screen gets cold, the bottom two thirds of the screen start to flicker, then the picture disappears and the screen is black, with the top third of the screen retaining a perfect miniature full size picture if watching the likes of YouTube etc.

If I put some heat on the screen with, say, a hairdryer, the full screen immediately returns and stays perfect until the screen gets cold, then fault returns.

Not sure if this problem started after I dropped phone.

Someone online suggested a bad connection from connector block to screen.

Anyone know the cause of this fairly common problem?

Thanks!