I just got my replacement U2715H which has the same issue as the first one. The reseller is saying that its a computer issue even though when I tried the second monitor, I just connected its power and ran a self-test (button 1 + button 4). This time they were fainter, and again after about 15 minutes of use they disappear, only to re-appear after a few hours of use! Is this a known issue? Both monitors have been manufactured September 2014.
