Owners of iPhone 6 and iPhone 6 Plus units afflicted by the alleged design defect dubbed “Touch IC Disease” won’t get much aid from the Genius Bar, but a U.S. law firm is looking to help users take Apple to court.

After filing a class-action lawsuit against Apple on Saturday for not fixing iPhones with Touch IC Disease, McCuneWright LLP says it’s searching for more iPhone 6 owners who have suffered from the defect.

Touch IC Disease, a glitch with the iPhone 6 and iPhone 6 Plus that results in gray, flickering bars at the top of the devices’ screens and a loss of touch sensitivity, has earned Apple its latest class-action lawsuit.

Caused by an apparent design flaw in the iPhone 6 series, Touch IC Disease is more prevalent among the larger iPhone 6 Plus devices. While the problem made headlines for the first time last week, a proposed class-action lawsuit filed Saturday claims Apple has long been aware of the defect, which can render devices useless.

iPhone 6 Plus units are much more likely than their smaller siblings to get “Touch IC Disease,” the flickering gray bars that are appearing on the screens of a growing number of aging devices, according to a smartphone repair expert who helped bring the problem to light.

Touch IC Disease, which affects the touchscreens of some older iPhones and renders them practically unusable, could potentially become a bigger problem for Apple than Bendgate, the “scandal” that followed the launch of the super-slim iPhone 6 line in 2014.