MFD screen going bad after repair

Hi All, I was wondering if someone could help me. A year ago my MFD screen went bad. I sent it in for repair. All was good until about a month ago where it started flickering in and out again. I sent it back to the place that did the repair because it was still under warranty. I received the unit back today and after installing it and driving the car around the screen started to cut on and off again. I wanted to know is there something else aside from a faulty MFD screen that can cause the MFD not to function properly (aside from a fuse as I know to check those)?