The teardown experts at iFixit reviewed the Galaxy Fold and have taken it apart as they usually do with new smartphone - to find out why some of early review units failed so quickly (which caused Samsung to delay the launch of their highly anticipated foldable phone).
According to their analysis, the Galaxy Fold design has a weakness - and dust or other particles could enter the phone through the gaps in the top, bottom and the back of the device. This could create "bumps" on the display as the foldable display is pressed against the backside of the phone when fully folded. iFixit speculates that this could be the cause of the some of the reported display failures (another possible problem could be the removal of the protective top polyimide film).
Hopefully Samsung will give us some more information soon.