I have two monitors, one of them being a VG248QE. When I watch movies, I like to use 'second screen only', thus leaving my primary monitor(the VG248QE) off. But it doesn't stay off. It will flash "Display port NO SIGNAL" repeatedly, though inconsistently. I have an MSI 1660 ti; driver is up to date. I tried pulling the power cord then plugging back in, but it did not work. All connection seem tight. Help!