U4924DW, screen flickering

Every once in a while, my Dell U4924DW screen starts flickering. After about 10 minutes or so it disappears again. I checked the cables and everything, but that doesn't seem to be the problem. It also flickers when no other device is connected to the monitor. I tried using a different power cable, but that didn't help either. We bought this monitor about a month ago or so, so it's brand new. We have several of these monitors, but I seem to be the only one who's experiencing this problem?