I had a DVI cable go on me recently, I DO have a few spares on hand fortunately, My IPS went black and I was NOT happy but first think I did was try a HDMI and it worked but I use that with my laptop a lot so I pulled a DVI out of a closet and switched them and all was good, The one that went I've had for years, But like everything else they do go from time to time. With the monitor being new I'm guessing the cable is, With it only going out momentarily you may just have a broken wire that has a weak connection in it (Wires touching but not connected) So I wuld try a new cable and go from there, there cheap and good to have on spare anyway just for these reasons anyway.