Samsung Galaxy Z Fold 4 open standing up on table

Credit: Ryan McLeod / Android Authority
  • Some users have reported that the Galaxy Z Fold 4 refuses to fold completely flat due to a hardware issue.
  • It looks like bristles from the internal sweeper brush are getting caught in the phone’s hinge.
  • The issue also seems to affect other Galaxy Z Fold devices, according to older user reports.

Samsung has an interesting solution to prevent debris from getting into its foldable phones, as the hinges are lined with broom-like sweeper brushes to effectively block and remove dirt. Now, it turns out that this innovation might be the cause of a serious Galaxy Z Fold 4 issue.

Some users on Reddit (h/t: SamMobile), leaker Evan Blass, and a few X users have reported that they’re unable to fully open the Galaxy Z Fold 4. A few of these users are reporting that the sweeper brushes are to blame.