Zero Off LCD lines disappearing

[ZachD]

So it appears my zero off gps is progressively losing lines of display at the bottom of the screen. It's becoming increasingly hard to determine the speed and whether the system is on or off. Boat is a 2008 SANTE with 450 hours. Is this fixable or do I need a new unit ? Any suggestions? Does Zero Off step up to assist on anything like this?

Thanks