Essentially, it looks as though Samsung was so focused on perfecting the folding mechanism on the smartphone/tablet hybrid that it made a major oversight: providing adequate protection against the ingress of debris between the OLED screen and the chassis bezel.
To achieve the fold, the thin bezel that surrounds (and protects) the screen leaves a gap where the two halves meet... This 7 mm gap doesn't seem like a huge deal, but it leaves the display exposed—so should something accidentally enter, it's curtains for the screen. (Oops.)Many reviewers experienced multiple issues while testing the device, including a random bulge appearing on the display, as well as flickering and failing screens. In many cases, the issues were enough to make the $1,980 device completely unusable.
When closed, the screen is protected—but the spine is flanked by massive gaps that our opening picks hop right into. These gaps are less likely to cause immediate screen damage, but will definitely attract dirt.
In a statement, Samsung said its initial findings from the inspection of reported issues on the display showed that they could be associated with impact on the top and bottom exposed areas of the hinge. It also said "substances" were found inside the device, which affected the display performance.
As iFixit notes, it will be interesting to see how folding designs manage to overcome these