Then, it looks like that problem is relevant to MCU/display_controller ^{(I'm not sure whether the devece's display is controlled by MCU or has the build in controller)} and I'm afraid  that  there will be a need to send device to manufacturer to replace it according to their  warranty statements.  If this will happen I would advocate to move (somehow) your stash  to  new addresses not related with your  SEED on Cold Card Q ^{(before sending device to manufacturer).}