Recently my monitor started flashing white when it’s being set to refresh rate lower than 75hz (the max possible refresh rate for it), basically the image disappears, screen goes black, then flashes white and image comes back. Changing the resolution or anything else besides rate doesn’t help, the flashes are consistent and also have a timing, not just happening randomly. That might sound like an inverter issue but the backlight always remains there. The source is also not the problem because this happens even when the monitor is not connected anywhere. What could be the reason to it and what are the possible fixes?