This is not a ribbon cable issue. First display you showed is outgassed. The display glass will have to be removed from the panel PCB and replaced. I highly doubt Vishay will be willing to do this. If they do it will probably cost you over $200. Second one, if it happens over time then likely you have some solder points failing under heat stress on the display PCB. Vishay will probably fix this. Someone mentioned a name and contact number a couple of years ago but I can't find the thread.

Honestly I would just convert to DMD Extender, it will cost about the same (a lot less if Vishay will not repair these) and you get customizable colors.

That harness is for logic related dropouts, this is outgassing of the display panel.