12c Lcd Blinking

I am using the 12c lcd display hooked to the mega 2560 for my flight simulator. I am using the program Mobil flight to link all my switches guages and lcd for my com 1. When I start the program and start flight sim, the lcd tends to blink. If I stop mobil flight it does not do it. I was looking at the mega board and it seems to blinks with the TX and RX lights on the mega board. Thanks for any help.

You haven’t given us much to go on. (Hint)