Screen aberrations on IFD 540

When I start my IFD 540, it has taken to showing the areas of the screen which should be black as fluorescent green, with wavy darker lines moving across it. It is like green snow on an old TV.

All data is still present, and unit appears to function normally.

So far, restarting it multiple times eventually seems to overcome the problem, with the black background areas reappearing. However, in general it is taking more and more restarts to before the display corrects itself.

JPI is showing 12.1 volts as it starts.

Looks like something serious, so have not flown with it.

Please comment as appropriate.

Regards

Jeff Bell

Voltage is engine stopped, battery on charger.

Have started it in this configuration hundreds of times while practicing.

If it is low voltage, then why would it correct itself after numerous restarts?

Regards

Jeff