I generated a new update package for your Max. It is of most recent dev stand. Please try to use it in order to reset the screen parameters. If it does not help, I guess the problem must be escalated to the warranty claim. It could be a kind of loosened connection of the screen to the PCB.
Here is the download link:
http://ereader-store.de/DATA/MAX_/Ma...e8bfd_user.zip