"We are aware of instances where the iPhone X screen will become temporarily unresponsive to touch after a rapid change to a cold environment".
Apple's tenth-anniversary iPhone, iPhone X (pronounced iPhone 10), is here. But, if you are looking for design innovations, the iPhone X is the way to go.
The iPhone 8 suffered from an earpiece crackling problem, but this seems to be different in that it relates to high volume sounds only. It also looks like the issue is more persistent than the green line problem as one who got his faulty iPhone X unit replaced found the same issue in the new unit.
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While it seems like it is on top of the temperature related screen freezing problem, Apple hasn't yet had anything official to say in relation to complaints about the vertical green line issue some customers are also reporting. Unfortunately for some iPhone X users, the green line across the display is thick and isn't disappearing by its own.
Users afflicted by the problem note that the location drifts away from where the user is, with the problem aggravated by high rates of speed like a auto on a highway.
However, the good news is that a fix for the same is most likely to come in iOS 11.2 update. So, if your handset has a unusual green line on it, contact the retailer and demand for a replacement. The severity varies, but it happens regardless of what you're playing and persists with replacement units.