U2312HM monitor backlight problems

I have problems similar to the one reported here. When changing the resolution, or switching between monitors using Win+P (I am using two monitors, the other one is an ST2210), the backlight occasionally does not turn on or the bottom right corner backlight is dark. See the image below for the dark corner. For the former, I know the image is being displayed as I can make out my desktop by shining a flashlight on the monitor. Factory reset did not fix it and built-in diagnostics passed. I bought this monitor in March 2013, but this has been happening for a little while now.