I have a monitor LC27F398FWNXZA that keeps flashing into store mode. Ive tried unplugging the power and HD MI, that didn't work to fix it. It has a button on the back that I can press for the menu and then shift it, up, down, left, right, no actual arrows or buttons in the back, just the one that can be pressed and moved different directions to select options. I've tried turning if off and on through the menu option, that didn't fix it either. Does anyone know how to fix it? I've had this monitor since at least 2020 and it just randomly started doing it.