Screen freezes intermittently with line at bottom of screen

A line at the bottom of my screen keeps appearing intermittently and then the TV freezes for a couple of seconds. It's about 4 parallel lines that runs across the bottom of the screen. It's doing this for all inputs I use, whether hdmi, usb, even just normal antenna. What could the problem be? My TV was recently in transit and I suspect the movers may have damaged it.