Isn't it set? Or is the weather too hot?
That's electromagnetic interference. What power or something is next to them to keep them away?
LCD display with a long time will be more or less jitter, ripple, you move the connection to the host and the display of the VGA line, the blue connector, or another one, if not resolved, to illustrate the display life.
I don't know what kind of liquid crystal display you use. There are several possibilities:1, the power supply is not clean, there is interference2, VGA signal line use time is too long, the signal distortion is too serious3, the LCD LVDS signal line is not in good contact.4, or the motherboard filter design is not very good.
